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%
1
Expert's answer
2015-10-20T10:20:51-0400
m(NaOH) = 4 g; 1 cm3 of H2O weights 1 g; V = 250 ml; m(H2O) = 250 g; m(the solution) = m(NaOH) + m(H2O); m = 254 g; w = m(the solute)/m(the solution) * 100% w (NaOH) = 4/254*100% = 1.57%
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