Q: The pH of a 0.5L HNO2-NO2 buffer solution was determined to be 4.23. The solution was mixed with 5g…
A: Given, pH of buffer solution = 4.23 pKa = 4.35 Volume of buffer solution = 0.5 L weight of HNO2 = 5…
Q: The indicator thymol pink has a Ka = 2 x 10-4. At pH =1 it is yellow and at pH=14 it is pink.…
A: This question belongs to strong acid and weak base titration using a thymol pink indicator. find the…
Q: 6. Calculate volume in ml of 0.200 M NAOH solution required to neutralize 1.858 g of primary…
A:
Q: A bottled carbonated mineral water (i.e. closed system) has a pH of 4.9 and an alkalinity of 4×10-³…
A:
Q: 1. (a) Using activities correctly and the short form of the Debye-Hückel model, calculate the pH of…
A: i) To Calculate the pH of the solution using activities.
Q: Two aliquot of a water sample is titrated against a strong acid using phenolphthalein and…
A: Alkalinity is the quantity of an aqueous solution that is needed to neutralize the acidity that…
Q: A mixture contains Na2CO3, NaOH and inert matter. A sample weighing 1.500 g requires 28.85 ml of…
A: Introduction: The given sample has a mixture of Na2CO3 and NaOH, here we use two indicators like…
Q: Approximately 6 mL of conc. perchloric acid ( 72% ) was transferred to a bottle and diluted with…
A: Molarity of a solution is defined as the number of moles of solute present in one litre of a…
Q: 3. The colour changes corresponding to the pH intervals for the three indicators are given in the…
A: So according to the given data and the indicator we have the following conclusion. :
Q: A mixture of pure BaCO3 and pure Na2CO3 weighs 1.000 g and has the total neutralizing power of…
A:
Q: Determination of sodium carbonate by acidimetric titration involves: Direct titration by acid…
A: Process of determination of sodium carbonate by acidimetric titration: CO32- + H+ → HCO3- HCO3- + H+…
Q: Describe the preparation of 100 mL 0.050 M and 100 mL 0.0050 M phosphate buffer (both having pH =…
A: A buffer is a solution that can resist pH change upon the addition of acidic and basic components.…
Q: A diprotic acid, H2A, has values of Kai = 1.0 x 10° and K2 = 1.0 x 101º. In a 0.10 M solution of…
A: Answer:- this question is answered by using the simple concept of calculation of equilibrium…
Q: Which of the following statement of neutralization titration experiment is correct? 1. OBromocresol…
A: Titration is a typical quantitative chemical analysis laboratory method for determining the…
Q: 6. Calculate volume in mL of 0.200 M NaOH solution required to neutralize 1.858 g of primary…
A: Given -> Molarity of NaOH = 0.200 M Weight of potassium hydrogen phthalate = 1.858 gm Molar mass…
Q: A biochemist working with bacteria requires a culture buffered at a pH of 3.6. Which of the…
A: Given that: pH = 3.6 Buffer solution is mixture of weak acid and its conjugate base . Buffer…
Q: A series of acid-base indicators were added to four separate samples of a solution with an unknown…
A: The data given is,
Q: | NaOH IN 25x10³ Q3: In a carbonate mixture containing HCO, CO², and NaOH, either alone or…
A:
Q: What are the common acid-base indicators for acidimetry-alkalimetry? Indicate the pH range and color…
A:
Q: Please give
A: Given,Molarity of NaOH = 0.248M.Volume of NaOH = 18.71mL = 0.01871L.Volume of H2SO4 = 10.00mL =…
Q: 4. The molar absorptivities of the indicator weak acid HIn (K_{a} = 1.42 * 10 ^ - 5) and its…
A:
Q: A 110.00 mL solution of 0.00195 M A3B2 is added to a 160.00 mL solution of 0.00155 M C3D4. What is…
A: Given: Volume of A3B2 = 110.0 mL concentration of A3B2 = 0.00195 M Volume of C3D4 = 160.0 mL…
Q: What is the function of the vacuum aspirator? Predict the color shift of the indicator as a…
A: Aspirator is a tool which uses suction to remove or collect something specially in medicine for…
Q: Given the chemical equation for the anthocyanin extract of red cabbage as an indicator. HIn + H20 S…
A: Indicator is a compound that indicates the acidic and basic character of the solution. These are…
Q: An alkaline sample of sodium compounds weighing 1.196 g was dissolved in water, cooled at 15 deg C,…
A: Alkaline compounds of sodium may involve sodium hydroxide (NaOH), sodium bicarbonate (NaHCO3) and…
Q: Indicator Measurement Colour of Indicator phenol red pOH = 6.8 Indicator Measurement Colour of…
A:
Q: 3. Complete neutralization of 10 mL of phosphoric acid solution by NaOH 0.1 N in the presence of…
A: During titration of phosphoric acid we can use either methyl orange and detect first end point…
Q: v. What is pH? Calculate the pH for 0.0001N NH4OH solution of 100mL volume. The pKb value for NH4OH…
A: Ammonium hydroxide is a weak base. The dissociation of the weak base is given by: NH4OH ↔ NH4+ + OH-…
Q: which is tribasic(H3Y). 25cm^3 of lemon juice was diluted to 250cm^3. 25cm^3 of the solution was…
A: The question is based on the concept of solutions. we have to quantitatively estimate the citric…
Q: 200 ml of a water sample required 20 ml 0.025M Hydrochloric acid using methyl orange as indicator…
A: Alkalinity in water comes from sodium carbonate and sodium bicarbonate present in water. When…
Q: The Ka values for nitrous acid (HNO2) and hypochlorous (HClO) acid are 4.5 x10-4and 3.0 x10-8,…
A: The pKa values of HNO2 and HClO is calculated below. The pKa of HClO is closer to the required pH…
Q: How much amount (in grams) do you need to prepare the following solutions 500.0 mL 0.1000 M stock…
A: Concept: The molarity of a solution can be calculated as the number of moles of solute divided by…
Q: Use acid-base titration to determine the concentration of: – A strong acid: HCl -0.100 M HCl…
A: pH = -log[H+]
Q: If the absorbance of one of the buffer solutions (pH = 4.604) was 0.314 and the absorbance of the…
A:
Q: Determine the pH of a solution containing 0.030 M NaOH and 0.025 M KI neglecting activities.
A: The answer to the following question is-
Q: Calculate the volume in liters of 0.545 M KOH necessary to titrate 0.0113 moles of hydrochloric…
A:
Q: What will the pH of the mixture that contains: 250 mL of 0.12 M of H2SO4 and 150 mL of 0.04 M of…
A: Let's first consider the neutralization reaction between H2SO4 and NaOH.
Q: Consider the following indicators: dinitrophenol (pKin = 3.5), bromothymol blue (pKın = 7),…
A: Indicators are the chemical components used in titrations (acid-base). They are added in a small…
Q: Methyl orange is an indicator used for detecting the pH of acidic solutions. The red, protonated…
A:
Q: In a lab, dissociation constant, K, of an acid-base indicator is measured. A 1.00 x 104 M solution…
A: Concentration (C) of the indicator = 1.00 x 10-4 M path length (l) of cuvette = 1.00 cm Molar…
Q: What Volume of the titrant is needed to reach the End Point having 5g of sample and 1N H2SO4 as a…
A: According to law of equivalence, an acid exactly neutralizes the same number of equivalents of base…
Q: A sample of material contains the components NaOH, Na2CO3, NaHCO3 , or possible mixtures of these.…
A: Weight of sample = 1 g normality of acid = 1.038 N
Q: Given that the Ka value of Thymolphthalein, weak acid and acid-base indicator, is equal to 1 x…
A: 1- In this question, we want to determine the pH of the solution in which indicator change the color…
Q: When adding 25 ml of a pulverizer containing a solution of M (NaOH 0.2) to a beaker containing 50 ml…
A: The acidic function is measure of the acidity of the solution and the most commonly used acidity…
Q: A weak acid (HA) with a pKa of 4.0 has a distribution constant of 5.2 between an organic and aqueous…
A: The fraction of HA acid in the organic phase at pH 2 and 6 is calculated:
Q: A solution contains Na2CO3 and NaHCO3. 10 mL of the solution required 2.5 mL of 0.1 M H2SO4 for…
A:
Q: The acid-base indicator "Thymol Blue" has two transition ranges as listed below (with the…
A: The pKa values of the forms of thymol blue can be calculated as: pKa=-log Ka
Q: Mr. Clean recently bought a laboratory-grade sodium carbonate from a chemical company known as Brand…
A:
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- A solution containing Mg2+ was buffered to pH 9.99 and titrated with EDTA. Eriochrome black T, with p?a1 = 6.3 and p?a2 = 11.6 was used as the indicator. It is a diprotic acid, H2E What is the fraction of the predominant form of eriochrome black T in solution at this pH? (To answer this, report the alpha fraction of the indicator’s most prevalent species at this pH)1.Determine the color of the indicator in a given condition: METHYL ORANGE IN AN ACIDIC ENVIRONMENT. 2.This is the measure of reproducibility of data within a series of results. 3.This is the chemical to be subjected to testing in titrimetric method of analysis. 4.Determine the type of assay employed for this substance: TARTARIC ACID 5.Determine the color of the indicator in a given condition: PHENOLPHTHALEIN IN AN ALKALINE ENVIRONMENT. Please help me answer this questions. the answers are on the image I attachedCalcium fluoride is considered as a relatively insoluble compound and therefore lime or slakedlime has been considered as a possible material to remove excess fluoride in water of boreholesin certain parts of the country. The solubility product of CaF2 is Ksp = 3 x 10 – 11 and that ofCa(OH)2 isKsp =8x10-61. How much lime can be added to the water to remove 10 mg of F- ion per litre ofborehole water?(The atomic masses are Ca: 40.08; F: 19.00; O: 16; H: 1)
- 1ml of 1mg/ml of diluted aspirin powder solution is titrated by 0.005M NaOH. Before titration, 5 ml ethanol, 14 ml CO2 free water, and 4 drops bromothymol blue indicator is added into diluted aspirin powder solution. Mass of 0.005M NaOH used is obtained by weight titration = 1.1384g . [Molar mass of aspirin =180.15]; for solution, 1g=1mL at 25 degree Celcius. Calculate the purity of the powder.Use acid-base titration to determine theconcentration of:– A strong acid: HCl -0.100 M HCl Phenolphthalein is used for endpoint determination– Changes from colourless to pink as a solution becomes more basic• Only need 2-3 drops per titration• pH range: 8.3-10A 370.00 mL solution of 0.00185 M A3B4 is added to a 390.00 mL solution of 0.00100 M C3D4. What is pQsp for A3D4?
- An experiment was performed in order to determine the concentration of a persulfate ( S2O8^-2) solution 2 I^- (aq) + S2O8^2- (aq) —> I2 (aq) + 2 SO4^2- (aq) A 25.00 mL aliquot of .1500 M KI solution was titrated to a purple blue endpoint with soduim persulfate as the titrant. The intial buret reading was 1.25 mL and the final buret reading was 15.78 mL. Calculate the concentration of the soduim persulfate. Determine the oxidation number of iodine, sulfur, and oxygen in the reaction above and determine which species is oxidized and which is reduced.25.0 cm3 of sodium hydroxide solution is tritrated against 0.2 mol dm–3 hydrochloric acid until the indicator just changes colour. 27.5 cm3 of the acid are required to reach the end point.Phenolphthalein is used as an indicator in the above experiment. What will be its colour change at the end point? From pink to yellow From pink to colourless From yellow to colourless From yellow to pinkA new indicator was found, at pH values less than 7.5 the indicator is blue and at values greater than 9.5 itis grey.A) What is the approximate pKa for this indicator?B) At a pH of 5.0, which species is dominant? HIn or In-?C) At a pH of 7.5, which species is dominant? HIn or In-?D) At a pH of 10.0 which species is dominant? HIn or In-?
- Double indicator titration of 1.000g powdered sample containing either alone or any compatible mixture of NaOH/Na2CO3/NaHCO3 and the rest are inert components. The sample was dissolved in 20 ml water then titrated with 0.50 M HCl and reach phenolphthalein endpoint at burette volume of 25.55 ml. Continuing titration, it reached methyl orange endpoint at burette volume of 9.45 ml. Calculate the percentage mass of the possible alkaline component/s.Mr. Clean recently bought a laboratory-grade sodium carbonate from a chemical company known as Brand X. He was supposed to use it in the production of detergents. Unfortunately, he was scammed by the company. He suspected that he purchased a crude sodium carbonate so he tasked the Quality Assurance Department to determine the components of the purchased chemical. The chemist assigned to analyze the sample used double indicator method. For the standardization of HCl titrant, 0.1025 g Na2CO3 of 99.5% purity (FW: 106.00) required 8.20 mL of the titrant to reach the phenolphthalein endpoint. FW: NaOH (40.00), NaHCO3 (84.01), Na2CO3 (106.00) a. What is the molarity of the titrant? The chemist obtained a 3.150 g sample and dissolved it in distilled water to produce a 50.0 mL solution. An aliquot of 10.00 mL was obtained and diluted in a 100.0 mL volumetric flask. A 50.00-mL aliquot of the diluted sample was taken and it required 25.70 mL of titrant for the methyl orange endpoint, while…A diprotic acid, H2A, has values of Ka1 = 1.0 x 10-6and Ka2 = 1.0 x 10-10. In a 0.10 M solution of H2A, what is [A2-]? a. 0.10 Mb. 0.20 Mc. 3.2 x 10-4d. 3.2 x 10-6 Me. 1.0 x 10-10 M