Given a stock of 10 M HCl describe bow to make 50 ml of 10 m

Given a stock of 1.0 M HCl, describe bow to make 50 ml of 10 mM HCl. Given a stock of 32% NaCl, describe how would one correctly make 500 ml of 5.6% NaCl.

Solution

1. we know that N₁ x V₁ = N₂ x V₂ , N₁= 1.0 M , V₁= ?? , N₂= 10mM =10/1000 M= 0.01 M ,V₂= 50 ml

so , V₁= ( 0.01 x 50 )/ 1 = 0.5 ml

thus one has to take 0.5 ml of 1 M HCl and dilute it to 50 ml so as to get 0.01 M HCl

2- we know that N₁ x V₁ = N₂ x V₂ , N₁= 32% , V₁= ?? , N₂= 5.6% ,V₂= 500 ml

V₁= ( 500 x 5.6 )/32 = 87.5 ml

thus by taking 87.5 ml from the stock of 32% and diluting it to 500 ml we can get 5.6% solution .