If a 25.0 mL sample of sulfuric acid is titrated with 50.0 mL of 0.025 M sodium hydroxide to a phenolphthalein endpoint, what is the molarity of the acid?

Question

If a 25.0 mL sample of sulfuric acid is titrated with 50.0 mL of 0.025 M sodium hydroxide to a phenolphthalein endpoint, what is the molarity of the acid? (A) 0.020 M (B) 0.100 M (C) 0.025 M (D) 0.050 M

Tardigrade Admin · Accepted Answer

M 1 V 1= M 2 V 2 (0 ⋅ 025 M )(0 ⋅ 050 L )=( M 2)(0 ⋅ 025 L ) M 2=0 ⋅ 05 M but, there are 2 H 's per H 2 SO 4 so [ H 2 SO 4] =0.025 M

Q. If a $25.0 m L$ sample of sulfuric acid is titrated with $50.0 m L$ of $0.025 M$ sodium hydroxide to a phenolphthalein endpoint, what is the molarity of the acid?

0.020 M

0.100 M

0.025 M

0.050 M

$M_{1} V_{1} = M_{2} V_{2}$
$(0 \cdot 025 M) (0 \cdot 050 L) = (M_{2}) (0 \cdot 025 L)$
$M_{2} = 0 \cdot 05 M$
but, there are $2 H$ 's per $H_{2} S O_{4}$ so $[H_{2} S O_{4}]$
$= 0.025 M$

Q. If a 25.0mL sample of sulfuric acid is titrated with 50.0mL of 0.025M sodium hydroxide to a phenolphthalein endpoint, what is the molarity of the acid?