Question #55737

A solution contains 4 grams of sodium hydroxide in 250ml of solution . If Na=23, O=16, H=1 and
1cm3
of water weighs 1g, what isthe concentration of the solution in grams per
dm3
?
12
14
16
18

Expert's answer

A solution contains 4 grams of sodium hydroxide in 250ml of solution.

1 cm^{3} of H_{2}O = 0.01 dm^{3} H_{2}O

m(NaOH) = 4 g

V(Solution) = 250 mL = 0.25 dm^{3}

w(NaOH) = m(NaOH)/ V(Solution) = 4/0.25 = 16 g/dm^{3}

Answer : The concentration of the solution is 16 g/dm^{3} .

1 cm

m(NaOH) = 4 g

V(Solution) = 250 mL = 0.25 dm

w(NaOH) = m(NaOH)/ V(Solution) = 4/0.25 = 16 g/dm

Answer : The concentration of the solution is 16 g/dm

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