Question #55691

A solution contains 4 grams of sodium hydroxide in 250ml of solution. If Na=23, O=16 , H=1 and
1cm3
of water weighs1g, what is the concentration of the solution in weight per weight percent?
2.81%
1.92%
1.57%
3.29%

Expert's answer

m(NaOH) = 4 g;

1 cm3 of H_{2}O weights 1 g; V = 250 ml; m(H_{2}O) = 250 g;

m(the solution) = m(NaOH) + m(H_{2}O);

m = 254 g;

w = m(the solute)/m(the solution) * 100%

w (NaOH) = 4/254*100% = 1.57%

Answer: 1.57%

1 cm3 of H

m(the solution) = m(NaOH) + m(H

m = 254 g;

w = m(the solute)/m(the solution) * 100%

w (NaOH) = 4/254*100% = 1.57%

Answer: 1.57%

## Comments

## Leave a comment