Q: Which of the following best describes the concept of 'equivalent' in acid-base chemistry?

The amount of acid or base that produces 1 mole of H\textsuperscript{+} or OH\textsuperscript{–} ions.

Q: Which formula correctly calculates the equivalent weight of an acid or base?

$\text{Eq Weight} = \dfrac{\text{molar mass (M)}}{n}$

Q: Which acid has an equivalent weight of 63 grams?

H\textsubscript{2}SO\textsubscript{4}

Q: Which of the following is the correct formula for calculating normality using equivalents and volume?

$\text{Normality (N)} = \dfrac{\text{Equivalent}}{\text{L solution}}$

Question 1

Which of the following best describes the concept of 'equivalent' in acid-base chemistry?

Accepted Answer

The amount of acid or base that produces 1 mole of H	extsuperscript{+} or OH	extsuperscript{–} ions.

Question 2

How many equivalents of acid are present in 2 moles of H	extsubscript{2}SO	extsubscript{4}?

Accepted Answer

$4 	ext{ Eq}$

Question 3

A solution contains 0.5 moles of Ca(OH)	extsubscript{2}. How many base equivalents does this represent?

Accepted Answer

$2 	ext{ Eq}$

Question 4

Which formula correctly calculates the equivalent weight of an acid or base?

Accepted Answer

$	ext{Eq Weight} = \dfrac{	ext{molar mass (M)}}{n}$

Question 5

If 1 mole of H	extsubscript{3}PO	extsubscript{4} is present, how many acid equivalents are there?

Accepted Answer

$3 	ext{ Eq}$

Question 6

A 1 L solution contains 0.35 g of H	extsubscript{3}PO	extsubscript{4}. What is the normality (N) of the solution? (Molar mass of H	extsubscript{3}PO	extsubscript{4} = 98 g/mol, n = 3)

Accepted Answer

$0.00357 	ext{ N}$

Question 7

Which acid has an equivalent weight of 63 grams?

Accepted Answer

H	extsubscript{2}SO	extsubscript{4}

Question 8

Calculate the number of equivalents in 2.7 g of ROH (molar mass = 90 g/mol, n = 1).

Accepted Answer

$0.026 	ext{ Eq}$

Question 9

A solution is prepared by dissolving 4.6 	imes 10^{-2} mol NaOH in 1 L. What is the normality (N) of the solution?

Accepted Answer

$4.6 	imes 10^{-2} 	ext{ N}$

Question 10

What is the equivalent weight of H	extsubscript{2}SO	extsubscript{4} if its molar mass is 98.086 g/mol and it provides 2 H	extsuperscript{+} ions?

Accepted Answer

$49.043 	ext{ g/mol}$

Question 11

How many grams of Mg(OH)	extsubscript{2} are needed for 0.18 mEq of base equivalent? (Eq weight of Mg(OH)	extsubscript{2} = 58 g/mol)

Question 12

A nurse needs to prepare 0.73 g of Ca(OH)	extsubscript{2} solution with 1.25 N. What volume (L) of solution is required? (Eq weight of Ca(OH)	extsubscript{2} = 37 g/mol)

Accepted Answer

$0.01925 	ext{ L}$

Question 13

Which of the following statements about normality is correct?

Accepted Answer

Normality measures the number of equivalents per liter of solution.

Question 14

If a solution contains 0.1 mol of HCl in 1 L, what is its normality?

Accepted Answer

$0.1 	ext{ N}$

Question 15

Which of the following would increase the normality of a solution?

Accepted Answer

Increasing the number of equivalents.

Question 16

A chemist dissolves 0.5 mol of H	extsubscript{2}SO	extsubscript{4} in 2 L of water. What is the normality of the solution?

Question 17

Which of the following is the correct formula for calculating normality using equivalents and volume?

Accepted Answer

$	ext{Normality (N)} = \dfrac{	ext{Equivalent}}{	ext{L solution}}$

Question 18

A student prepares a solution by dissolving 0.1 mol of Ca(OH)	extsubscript{2} in 1 L. What is the normality of the solution?

Accepted Answer

$0.2 	ext{ N}$

Equivalents, Equivalent Weight, and Normality in GOB Chemistry

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