Question

A solution with a concentration of 20% is diluted 1/10 and then again by 1/10. Find the final percent concentration.

Answer 1

1st dilution=1:10, V1=10

2_nd dilution=1:10, V=20

concentration ,C1=20%

$c2 = (c1V1) ÷ V.$

C2=(20*10)/20

C2=10%