A 4.00 g impure sample of is dissolved in water and diluted to exactly 250.0 mL

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

A 4.00 g impure sample of

\text{KOH}

is dissolved in water and diluted to exactly 250.0 mL. A 25.00 mL aliquot of this solution requires 24.60 mL of 0.200 M

\text{HCl}

to reach the equivalence point.

\text{KOH}(\text{aq})+\text{HCl}(\text{aq})\rightarrow\text{KCl}(\text{aq})+\text{H}_2\text{O}(\ell)

What is the percent purity of

\text{KOH}

in the original solid sample? (a)

48.1\ \%

(b)

69.0\ \%

(c)

6.90\ \%

(d)

34.5\ \%