Question

Potassium hydrogen phthalate, KHC8H5O4, or KHP, is used in many laboratories, including general chemistry laboratories, to standardize solutions of base. KHP is one of only a few stable solid acids that can be dried by warming and weighed. A 0.3420-g sample of KHC8H5O4 reacts with 35.73 mL of a NaOH solution in a titration. What is the molar concentration of the NaOH

Answer 1

Answer:

Molarity of the sodium hydroxide solution is 0.04687 M.

Explanation:

Amount of potassium hydrogen phthalate = 0.3420 g

Moles of potassium hydrogen phthalate =$\frac{0.3420 g}{204.2 g/mol}=0.001675 mol$

$KHC_8H_4O_4+NaOH\rightarrow NaKC_8H_4O_4+H_2O$

According to reaction, 1 mole of potassium hydrogen phthalate reacts with 1 mole of sodium hydroxide, then 0.001675 moles pf potassium hydrogen phthalate will :

$\frac{1}{1}\times 0.001675 mol=0.001675 mol$ of NaOH

Moles of sodium hydroxide = 0.001675 mol

Volume of sodium hydroxide solution =  35.73 mL = 0.03573 L  (1 mL = 0.001 L)

$Molarity=\frac{Moles}{Volume (L)}$  

Molarity of the sodium hydroxide solution :

$=\frac{0.001675 mol}{0.03573 L}=0.04687 M$