$$pH = pK_a + \log \left( \frac{[\text{Salt}]}{[\text{Acid}]} \right)$$

Question 1

Which of the following best describes a Lewis acid according to the Lewis concept?

Accepted Answer

A substance that accepts an electron pair

Question 2

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-9}$$ M. What is its pH and is it acidic, basic, or neutral?

Accepted Answer

pH = 9, basic

Question 3

Which of the following is a correct expression for the solubility product ($$K_{sp}) of$$ $$MgCl_2$$?

Accepted Answer

$$K_{sp} = [Mg$$^{2+}$$][Cl^-]^2$$

Question 4

A buffer solution is prepared by mixing acetic acid and sodium acetate. Which equation would you use to calculate its pH?

Accepted Answer

$$pH = pK_a + \log \left( \frac{[	ext{Salt}]}{[	ext{Acid}]} ight)$$

Question 5

During a titration of a weak acid with a strong base, what is observed at the equivalence point?

Accepted Answer

The pH is greater than 7 due to the formation of a basic salt

Question 6

Calculate the pH of a $$2.516 	imes 10$$^{-4}$$ M NaOH solution.

Accepted Answer

pH = 10.40

Question 7

Which of the following is a property of a good primary standard?

Accepted Answer

It should be stable and have a known purity

Question 8

What is the buffer capacity if 0.01 mole of NaOH is added to an acetate buffer and the pH changes from 4.76 to 4.85?

Accepted Answer

0.11

Question 9

Which indicator would be most appropriate for the titration of a strong acid with a strong base?

Accepted Answer

Phenolphthalein

Question 10

A solution of $$0.002 M $$niacin ($$K_a = 1.40 	imes 10$$^{-5}$$) is prepared. What is the pH? (Use pH$$ = \frac{1}{2}(pK_a - \log C_A)$$)

Accepted Answer

pH = 3.8

Question 11

Which of the following best describes the common ion effect?

Accepted Answer

The addition of an ion already present in equilibrium decreases the solubility of a salt

Question 12

Which of the following is NOT a requirement for a secondary standard solution?

Accepted Answer

It must be a pure substance with known equivalent weight

Question 13

Which titration method would be most appropriate for determining the total hardness of water?

Accepted Answer

Complexometric titration with EDTA

Question 14

What is the pH of a $$1.207 	imes 10$$^{-5}$$ M KOH solution?

Accepted Answer

pH = 9.08

Question 15

Which of the following best describes a titrant in titrimetric analysis?

Accepted Answer

A solution of known concentration added from a burette

Question 16

Which of the following is a real-world application of acid-base titrimetry?

Accepted Answer

Determination of acid content in fruit juice

Question 17

A student is asked to prepare a 0.1 M solution of NaCl. Which formula should they use to calculate the number of moles required?

Accepted Answer

$$M = \frac{n}{L}$$

Question 18

Which of the following best describes the equivalence point in a titration?

Accepted Answer

The point where the amount of titrant added is stoichiometrically equivalent to the analyte

Question 19

Which of the following is a correct statement about the relationship between $$pK_a$$, $$pK_b$$, and $$pK_w$$?

Accepted Answer

$$pK_w = pK_a + pK_b$$

Question 20

Which of the following is an example of a precipitation titration?

Accepted Answer

Titration of chloride with silver nitrate

Comprehensive Study Notes on Titrimetric Analysis and Acid-Base Chemistry

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