9-5. Explain why the indicator cresol red changes color when the pH is lowered from 10 to 6. What colors will be observed at pH 10, 8, and 6? Why does the color transition require ~2 pH units for completion?

Q: Construct a titration curve by reacting a 50.00mL aliquot of NaCN 0.0500M with the 0.100M HCl…

A: we need to calculate pH of the solution after addition of given amount of HCl to NaCN solution

Q: 9-2. Why is the pH of a buffer nearly independent of concentration?

A: The pH of a buffer is calculated by using the Henderson-Hasselbalch equation:

Q: A 50.0 mt of basic solute (K, 158 x 10 ) is titrated with a 25.0 ml of 0.100 M HCI solution. Which…

A: Given: Kb of base solute = 1.58 X 10-9  Volume of base solution = 50.0 mL = 0.050 L…

Q: Phenolphthalein (Ka = 1 x 10−9) would be a good indicator choice for the titration of a weak base…

A:

Q: Dilute phosphoric acid(K1 = 7.5 x 10-3) solution is titrated with standard NaOH solution to form…

A: Which indicators is used not used for this titration are given below.

Q: 50.00 mL of benzoic acid (HC7H5O2) 0.1000 mol L-1 are titrated with NaOH 0.1000 mol L-1. Calculate…

A: Given: Volume of benzoic acid = 50.00 mL Concentration of benzoic acid = 0.100 mol/L  Concentration…

Q: acetic acid, CH3COOH is a commercially weak acid with a value of Ka = 1.8 x 10 ^ -5. In an…

A: Dissociation of weak acid: CH3COOH⇋CH3COO- + H+ Ka=CH3COO-H+CH3COOH

Q: Given the transition range for the pH indicators below, which indicator is most appropriate for the…

A:

Q: A 50.0 mL of basic solute (Kb = 1.58 x 109) is titrated with a 25.0 mL of %3D 0.100 M HCI solution.…

A: Depending upon the PH of the solution,  one can determine which indicator is the best for this acid…

Q: What would be the ideal buffer range for an acid if its Ka = 1.6 x 10-5?

A:

Q: An indicator with an acid dissociation constant of 2.19 x 10‑5 could typically be used for a…

A: The question is based on the concept of titration. it involves  the application of indicator. we…

Q: Calculate the pH after the addition of 60.0 mL of base in the titration of 50 mL of 0.100 M HA using…

A: Given: Vol of base(NaOH) = 60mL Concentration of NaOH = 0.100M vol of HA = 50mL Concentration of HA…

Q: Describe how you would accurately prepare 100.0 mL of a buffer solution with pH 4.7 using 1.0 M…

A: Given:  pH = 4.7  Ka = 1.8 x 10-5  pKa = -log(1.8 x 10-5) = 4.745  [CH3COOH] = 1 M  [NaOH] = 1 M…

Q: 3. Which acid is most suitable to use when preparing a buffer with pH = 7? A. ΗΝΟ В. СН,СООН (Ка (Ка…

A: The buffer solution is the Solution which resist the change in pH when a small amount of acid or…

Q: The indicator ethyl red has Ka = 3.8 x 10-6. Over what approximate pH range does it change color?

A: Indicators are the chemical compounds which show the color at a particular pH. At a particular pH…

Q: one of the following statement is correct about the structures of the given indicator HO 2 HO. a.…

A:

Q: Q.1: Determination of % composition of mixture of KI & KNO3 using Eoscein as indicator.

A: Percent composition by mass is given by the percentage composition of a given compound is the ratio…

Q: What is the hydronium-ion concentration in a solution resulting from mixing 133 mL of 0.100 M HCN…

A: Answer:- This question is answered by using the simple concept of calculation of hydronium ion using…

Q: What are the concentrations of each of the following species in 1.50 M sodium oxalate, Na2C2O2?…

A: Given: Concentration of sodium oxalate, Na2C2O4 = 1.5 M Ka1 for oxalic acid = 5.9 x 10-2 Ka2 for…

Q: 21. For which of the following titrations would phenolphthalein (end point occurs at pH = 9.1) be…

A: The endpoint of the phenolphthalein occurs at pH 9.1. It states that this indicator is best for…

Q: What are the common acid-base indicators for acidimetry-alkalimetry? Indicate the pH range and color…

A:

Q: What is the resulting pH of mixing 50.0 ml 0.0500 M NH4Cl (aq) with 10.0 ml 0.0500 M HNO3(aq)? If…

A: Given :  Molar concentration of NH4Cl = 0.0500 M  Volume of NH4Cl solution = 50.0 ml  Molar…

Q: KOH is used to titrate an acid to the equivalence point. The indicator thymolphthalein was chosen as…

A: The chemical indicator is any substance which gives visible sign, usually by colour change, of the…

Q: 9-3. Neglecting activity coefficients, calculate the pH of 5.0 × 10 8 M HCIO4. What fraction of H is…

A:

Q: 1.Which of the following substances have a solvatochromic property? a.potassium hydrogen phthalate…

A: According to Q&A guidelines of Bartleby, we are supposed to answer only the first question out…

Q: For bromocresol green indicator, the pka of the indicator is about 4.7.  Estimate the pH range over…

A: Indicators are used to indicate the nature of the solutions when they are added to it by changing…

Q: An indicator (Ka = 1.7X106) is red but changes to blue when ionized. The indicator %3D was used in…

A: option (c) is correct. 5.32-7.32.

Q: The indicator propyl red has Ka = 3.3 × 10-6. What would be the approximate pH range over which it…

A: Given information,      Ka value of the given indicator propyl red is 3.3 × 10-6

Q: what is the pH of a solution prepared by mixing 50.0 mL of 0.125 M amonia and 25.0 mL of 0.100 M…

A:

Q: A 50.0 ml of acidic solute (Ka = 1.20 x 10-2) is titrated with a %3D 2.50 mL of 1.00 x 10-5 M NAOH…

A: Given: Ka of acid solute = 1.20 X 10-2  Volume of acid solution = 50.0 mL = 0.050 L…

Q: A certain indicator, HA, has a K₂ value of 4.0 x 10-6. The protonated form of the indicator is red…

A: Given data :  Ka=4.0×10-6pH=7 To find: pKa and color of indicator at pH 7

Q: A solution made by mixing 105.00 mL of 1.050 M CH3COOH with 35.00 mL of 0.750 M NaOH. For…

A: A buffer resists a considerable change in pH when a small amount of acid or base is added to it. The…

Q: 3. Complete neutralization of 10 ml. of phosphoric acid solution by NaOH 0.I N in the presence of…

A: During titration of phosphoric acid we can use either methyl orange and detect first end point…

Q: What is the appropriate acid-base indicator for the titration of 50.00 mL of 0.100 N NaOH with…

A: NaOH is a strong base and HCl is a strong acid. The titration will involve a sudden change from…

Q: Why would an indicator end point not be very useful in the titration curve for pKa  10.00

A: When there is a sharp change in the pH of the solution with little amount of titrant added when…

Q: It is desired to buffer a solution at pH = 4.30. What molar ratio of CH3COOH to NaCH3COO should be…

A: Given;

Q: Which substance is the primary standard used for the accurate determination of HCl titrant…

A: Primary standard which can be weighed easily, and which is so pure that its weight is truly…

Q: 8- Which of the indicator would be most suitable for use during the titration of ammonia with…

A: Given , acid : hydrochloric aid = HCl base : ammonia =NH3

Q: A 50.0 mL of acidic solute (Ka 2.6 x 10-2) is titrated with a %3D 25.0 mL of 0.001 M NaOH solution.…

A: The is based on the concept of titrations. we have to identify the correct indicator for the given…

Q: Which of the following indicators would be the best to use when 0.050 M benzoic acid (Ka = 6.6 ×…

A: Benzoic acid reacts with NaOH to form sodium benzoate. C6H5COOH + NaOH ----> C6H5COONa +H2O…

Q: Which of the given statements are CORRECT for an indicator that ionizes as shown below (Ka=1.0 x…

A:

Q: A 50.0 mL of acidic solute (Ka = 2.6 x 10-2) is titrated with a 25.0 mL of 0.001 M NaOH solution.…

A: Since you have posted multiple questions, we are entitled to answer the first only.

Q: 7- In acid-base titration, the Phenolphthalein indicator will change its colour from what to what? *…

A: Acid-base titration: Titration is a method to determine the concentration of unknown acid by using…

Q: An indicator (Ka = 1.7X10-6) is red but changes to blue when ionized. The indicator was used in the…

A: when indicator changes its colour, the concentration of both the species of indicator will exist in…

Q: 9. Phenolphthalein, a colorless weak acid (K₂= 6.31 x 10-10) which dissociates in water forming pink…

A: “Since you have asked multiple question, we will solve the first question for you. If youwant any…

Q: Methyl red (Ka = 6.3 x 10-6) is a common acid-base indicator. Its un-ionized form is red and its…

A: PKa =- log Ka  Where Ka = dissociation constant

Q: Methyl orange is an indicator that changes color over a range from pH =3.1 to pH =4.4 . What is Ka…

A: Ka = 1.6 × 10-4

Q: Read sec. 14.7 2, then calculate the volume at equivalence and the pH at each of the following…

A: NOTE

Q: Identify which indicator will be suitable for the following titrimetric analyses: a. 0.100 M…

A: The answer is as follows: