Question

Calculate the molarity of a solution containing 7.0g of sodium hydroxide in 875 ml of solution.

Answer 1

Answer:

0.2M

Explanation:

first calculate no. of moles of NaOH

$n=\frac{m}{M_{R} }$

m=7.0g

$M_{R}=23+16+1=40$

$n=\frac{7}{40}$

n=0.175

molarity = n/v

v=875ml

convert to litres

v=875/1000

v=0.875L

molarity=0.175/0.875

=0.2M