Acid Base Titration(General Knowledge > General Science ) Questions and Answers

Question 1. In which of the following reactions does H2PO4- act as an acid?
  1.    H3PO4 + H2O --> H3O+ + H2PO4-
  2.    H2PO4- + H2O --> H3O+ + HPO42-
  3.    H2PO4- + OH- --> H3PO4 + O2-
  4.    The ion cannot act as an acid
Explanation:-
Answer: Option B. -> H2PO4- + H2O --> H3O+ + HPO42-
Question 2. A titration involves the chemical reaction between an analyte solution and the
  1.    titrant
  2.    titrator
  3.    standard
  4.    all of the above
Explanation:-
Answer: Option D. -> all of the above
Question 3. What is the impact of not transferring all of the KHP from your weigh boat to the Erlenmeyer in Part A?
  1.    lower volume of KHP needed
  2.    lower volume of base needed
  3.    concentration of base will be underestimated
  4.    no impact at all
Explanation:-
Answer: Option B. -> lower volume of base needed
Question 4. What is the long graduated piece of equipment called?
  1.    Pipette
  2.    Tube
  3.    Burette
  4.    Measuring Cylinder
Explanation:-
Answer: Option C. -> Burette
Question 5. Common basic salts in antacid tablets include all except
  1.    calcium dihydrogen phosphate
  2.    aluminum chloride
  3.    magnesium hydroxide
  4.    sodium bicarbonate
Explanation:-
Answer: Option B. -> aluminum chloride
Question 6. What makes KHP a primary standard?
  1.    highly stable and can be dried of atmospheric moisture
  2.    reacts precisely and reproducibly
  3.    can be precisely massed and molecular mass known
  4.    all of the above
Explanation:-
Answer: Option D. -> all of the above
Question 7. What is the impact of adding small volume of water to the KHP in the Erlenmeyer in Part A?
  1.    dilutes KHP so less base solution required to neutralize
  2.    need to add a lil bit more KHP to even things out
  3.    must redo titration
  4.    no impact; only need approximate KHP solution volume for Part A
Explanation:-
Answer: Option D. -> no impact; only need approximate KHP solution volume for Part A
Question 8. Why do we use water to wash the solution from the burette into the flask
  1.    To ensure accuracy (all solution reacts)
  2.    To dilute the reagents
  3.    To help the reaction go faster
  4.    To see the colour of the indicator better
Explanation:-
Answer: Option A. -> To ensure accuracy (all solution reacts)
Question 9. Which of the following is a conjugate acid/base pair?
  1.    HCl/OCl-
  2.    H2SO4/SO42-
  3.    NH4+/NH3
  4.    H3O+/OH-
Explanation:-
Answer: Option C. -> NH4+/NH3
Question 10. What is the normal pH of gastric (stomach) juices?
  1.    3
  2.    6
  3.    9
  4.    I don't drink juice
Explanation:-
Answer: Option A. -> 3
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