Volume of water needed to mix with 10 mL 10N `HNO_(3)` to get 0.1 N `HNO_(3)` is :

Options

A. 1000 mL
B. 990 mL
C. 1010 mL
D. 10mL

Answer

B

Explanation

Given ` N _ 1 = 10 N, V _ 1 = 10 ml , N _ 2 = 0.1 N, V _ 2 = ? `
` N _ 1 V _ 1 = N _ 2 V _ 2 `
or ` 10 xx 10 = 0.1 xx V _ 2 `
or ` V _ 2 = (10 xx 10 ) / ( 0.1 ) , V _ 2 = 1000 ml `
Volume of water to be added ` = V _ 2 - V _ 1 = 1000 - 10 = 990 ml `.