45.00 mL of unknown calcium hydroxide solution is titrated with 0.450 M standard nitric acid solution. If 41.37 mL of the standard acid solution is required to reach a phenolphthalein endpoint, what is the molarity of the unknown calcium hydroxide solution

0.0207 M

Explanation:

The equation of the reaction is

2HNO3(aq) + Ca(OH)2(aq)> Ca(NO3)2(aq) + 2H2O(l)

concentration of  acid CA= 0.45 M

concentration of base CB = ???

Volume of acid VA = 41.47 ml

Volume of base VB = 45.00 ml

Number of mole of acid NA = 2

Number of moles of base NB=1

Given;

CAVA/CBVB =NA/NB

CAVANB =CBVBNA

CB = CAVANB/VBNA

CB= 0.45 * 41.47 * 1/45.00 *2

CB = 0.0207 M

fe 55.85 g/mol and h2o 18.02 g/mol.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.