Why is Bromocresol green used for the base unknown while phenolphthalein is used for the acid unknown? Explain your answer in terms of the pKa values of the indicators.
Q: Why was the sample being made alkaline with 3M KOH and heated for the qualitative test for NH4+?
A: The reason why was the sample being made alkaline with 3M KOH and heated for the qualitative test…
Q: Calculate the percentage of Atropine in Belladonna powder using 10.7 g sample and adding 20 mL of…
A: Given data,Mass of sample=10.7gNormality of H2SO4=0.0225NVolume of H2SO4=20mLNormality of…
Q: What is the purpose of adding HCI to the aqueous layer in this experiment? To remove the impurity To…
A:
Q: How would the calculated value of pKa of the unknown acid be affected (higher, lower, or no change)…
A: The correct answer is given below
Q: Why is there a need to correct conductivity of the sample solution
A:
Q: Since EDTA titration must be done at pH 10, which procedure will help in removing the HCl in the…
A: Answer - EDTA - Ethylenediaminetetraacetic acid (EDTA) is an aminopolycarboxylic acid with the…
Q: How can the Eugenol content be separated from the alkaline solution?
A: Eugenol also known as clove oil. This oil is extracted from cloves and is used to treat toothache,…
Q: B) A solution mixture of propanoic acid (2.5M) and h N (1.5M), calculate the CN/CH3CH2CO0 ratio.…
A: We have given that A solution mixture of propanoic acid (2.5M) and HCN (1.5M), calculate the…
Q: At what pH range(s) will the two compounds be >90% in different layers?
A: find PH range
Q: Explain why different results are observed when HCl and H2SO4 are added to brine?
A: The different results are observed when HCl and H2SO4 are added to brine because in HCl, due to…
Q: The pKa of salicylic acid is 2.97 whereas the pKa of benzoic acid is 4.19. Why is salycilic acid a…
A: Given statement and information, Salicylic acid is a much stronger acid compared to…
Q: 0.100 g sample of phthalic acid was dissolved in 100 mL of water. When 25 ml of diethyl ether was…
A: Introduction- Solvent extraction is a process where 2 immiscible solvents are separated along with…
Q: 2. Answer these questions about separating benzoic acid (pKa = 4.2) and aniline (which is basic, pKa…
A: Reverse phase high pressure liquid chromatography (HPLC) is a separating process where a non-polar…
Q: A purified protein is in a HEPES (N-(2-hydroxyethyl)piperazine-N-(2-ethanesulfonic acid)) buffer at…
A: Given: concentration of NaCl = 600 mM Since, 1 mL of sample, 600 mM NaCl and HEPES buffer is…
Q: When estimating a mixture of carbonates and bicarbonates, the volume descending when using the…
A: A question based on stoichiometry that is to be accomplished.
Q: 2. At about 26,000 feet, if the partial pressure of oxygen is about 30 torr, what is the fractional…
A: given: partial pressure of O2 = 30 torr P50 = 26 Hill coefficient of hemoglobin n = 3 fractional…
Q: An analyte has an Rf value of 0. 75 What does that indicate about the solubility of the analyte in…
A: Chromatography is a technique of separation Here we are required to indicate the solubility of the…
Q: Why Tetrafluoroboric acid diethyl ether complex (HBF4.Et2O) would be used over HCl for protonation…
A: Tetrafluoroboric acid is a superacid. It comprises of two parts: 1. H+ 2. BF4-
Q: 1. Why are the acidic extracts and the basic extracts cooled before neutralization during Acid/Base…
A: Question 1 answer: Acid-Base reactions are exothermic. So, during neutralization the solutions can…
Q: For acetate with a pKa of roughly 4.2, what is a lowest pH where this molecule could serve as a good…
A: Given the pKa value of the buffer, pKa = 4.2 According to Henderson equation: pH = pKa + log[A-][HA]
Q: Determine each statement if it is positive or negative base on the chemical structure in the…
A: The functional group of a molecule is a key constituent that provides a notable chemical reaction to…
Q: Discuss the significance of the following processes and what constituent is being determined: a.…
A: The significance of the processes and presences of constituent is given below.
Q: What would be the effect of a more dilute solution of NaOH on the titration?
A: In the titration process , the titrant is added slowly to the unknown solution . When we dilute the…
Q: Given a 0.300 M solution of anserine at its isoelectric point and ready access to 0.100 M HCl, 0.100…
A:
Q: Kiko, a Chem 31.1 student, accidentally shuffled two test tubes with different compounds on his way…
A: We have to determine the compounds A and B.
Q: In excess of alkaloidal reagent, did the precipitate formed dissolve or not? What is the evidence
A: The alkaloids are a class of vegetable compounds which are chemically similar to ammonia. Like…
Q: Draw a titration curve for the tetrapeptide Trp-Asp-Lys-Gly. Label all pK,s, the pl and the net…
A: Trp-Asp-Lys-Gly
Q: Discuss the principles of the colorimetric and enzymatic methods for quantitating uric acid.
A: Generally there are two methods of quantitating uric acid . Colorimetric method Enzymetic method
Q: 2. A sample of material contains for its active components NaOH, NazCO3, NaHCO3, or compatible…
A:
Q: What are the conditions for a successful gravimetric analysis.
A: As per bartleby guidelines I answered only first question so please don't mind.Thanks in advance.
Q: create a separations flow chart for Sb3+, Fe3+, Zn2+, Al3+, Cd2+ without using sulfides or…
A:
Q: 3) A solution mixture of propanoic acid (2.5M) and h N (1.5M), calculate the CN/CH3CH2COO ratio.…
A: We have given that A solution of propanoic acid (2.5M) and HCN (1.5M) calculate CN/CH3CH2COO- Ka…
Q: State the use of saturated sodium chloride in the purification of isoamyl acetate and how it acts?
A: Formation of isoamyl acetate can be done by help of esterification method. In this process Acetic…
Q: Explain the reactions involved in separation of p-nitroaniline from mixture contain 3 components…
A: Given Mixture contain 1 Benzoic acid 2 Napthalene 3 paraNitroaniline Separation of paraNitroaniline…
Q: Why is nitric acid added when ammonium thiocyanate solution is standardized
A: The question is based on the concept of volhard titration. we have to explain the need of nitric…
Q: Based on the graph, the retention of 4-aminobenzoic acid is not affected changes in mobile phase pH…
A: 4-amino benzoic acid remains in zwitterionic form in ph range 2-9 (approx) so on changing ph of…
Q: what are the clinical significance of (a) sodium nitroprusside test (b) Molisch Test
A: (a) the sodium nitroprusside test is used to determine the presence of ketoacids in the blood and…
Q: For two samples of cocaine, A was made up in an aqueous solution of pH 2.8, while B was made up in…
A: Given:- The cocaine is the base due to tertiary amine group as a base. Therefore in…
Q: Which of the following is true for EDTA solution? A. It always needs to be adjusted (it needs to be…
A: A multiple choice question based on types of standard solution, which is to be accomplished.
Q: Consider a TLC plate loaded with the following compounds: Phenyl acetate, glycine, butyric acid, and…
A: Given,Phenyl acetate, glycine, butyric acid, and cyclohexanol.
Q: evise an acid/base extraction method capable of separating Eugenol from affeine. The pKa of eugenol…
A:
Q: Question attached
A: Paper chromatography is a qualitative method in order to detect the presence of colored components.…
Q: How would the calculated molar concentration of the analyte be affected if the burette is rinsed…
A: Before starting any titration it is very important to rinsed the burette with the corresponding…
Q: Why is the percentage of acetic acid in date vinegar more than apple cider vinegar?
A: Both vinegars are produced by fermentation. in the formation of date vinegar, the sugar is converted…
Q: What are some possible explanations for why the melting point of your isolated caffeine was lower…
A: To find: The reason for the depression in melting point of isolated caffeine
Q: In the Assay of Sodium Chloride, what is the purpose of adding nitric acid in the solution? It is…
A: As per the guideline, since you have asked multiple questions, we have solved the first question for…
Q: If the synthesized aspirin was not dried before melting point determination, what would be its…
A: If the synthesized aspirin was not dried before melting point determination, then some amount of…
Q: 3) Explain in a few short sentences how IMFS, acid/base reactions, equilibrium, and thermodynamics…
A: Ibuprofen is non steroidal anti-inflammatory drug. It is also used as an important antipyretic and…
Q: 1. What was the purpose of the concentrated sulfuric acid in the first step in the synthesis of…
A:
Q: A purified protein is in a HEPES (N-(2-hydroxyethyl)piperazine-N-(2-ethanesulfonic acid)) buffer at…
A: Initial concentration of NaCl solution, Minitial = 600 mM Initial volume taken, Vinitial = 1 mL…
Why is Bromocresol green used for the base unknown while phenolphthalein is used for the acid unknown? Explain your answer in terms of the pKa values of the indicators.
Step by step
Solved in 2 steps
- The pKa of salicylic acid is 2.97 whereas the pKa of benzoic acid is 4.19. Why is salycilic acid a much stronger acid compared to benzoic acid? (It is not enough to say “because the pKa is lower...”)1. What was the purpose of the concentrated sulfuric acid in the first step in the synthesis of aspirin? 2. What was the purpose of performing titration analysis on the product aspirin synthesized? 3. If the synthesized aspirin was not dried before melting point determination, what would be its effect?Which criterion is used for the purity of a sample of caffeine? Why is this criterion used instead of Murexide test?
- What is the purpose of performing a blank titration in the assay of ibuprofen? A. To determine the amount of titrant that would react with the indictor. B. To determine the amount of titrant that would react with ibuprofen. C. To determine the amount of titrant that would react with potassium hydrogen phthalate. D. To determine the amount of titrant that would react with free acid in the solvent.Discuss the principles of the colorimetric and enzymatic methods for quantitating uric acid.1.Describe other melting point apparatus that are available for routine analysis. 2. Explain the differences in melting point of these test compounds by relating with their structures and intermolecular or intramolecular forces of attraction: a. benzoic acid and salicylic acid b. p-aminobenzoic acid and salicylic acid c. oxalic acid and succinic acid d. succinic acid and malic acid
- 1. Explain the differences in melting point of these test compounds by relating with their structures and intermolecular or intramolecular forces of attraction: a. benzoic acid and salicylic acid b. p-aminobenzoic acid and salicylic acid c. oxalic acid and succinic acid d. succinic acid and malic acid Please provide link for citation.The pKa values of the conjugate acids of 2-aminopyridine (6.71) and 4- aminopyridine (9.11) are as shown. Why are these structures so much more basic than pyridine?The pKa values of the conjugate acids of 2-aminopyridine (6.71) and 4- aminopyridine (9.11) are as shown. Which nitrogen is the more basic in these structures and why?
- What is the role of Glycerin in the assay of Boric Acid?I. The reagent prevents the formation of pink color earlier than the expected endpoint.II. The reagent allows the reaction of protons from the acid sample with the hydroxyl ions from the titrant.III. It enhances the water solubility of the difficultly soluble boric acid. a. I, II & III b. II & III c. I & II d. I only e. I & IIIExplain the suitability of using phenolphthalein indicator in the assay of acetic acid.Based on the graph, the retention of 4-aminobenzoic acid is not affected changes in mobile phase pH because it is zwitterionic. True of Flase?