Answer to Question #55737 in General Chemistry for daniel

Question

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

Answer 1

A solution contains 4 grams of sodium hydroxide in 250ml of solution.
1 cm³ of H₂O = 0.01 dm³ H₂O
m(NaOH) = 4 g
V(Solution) = 250 mL = 0.25 dm³
w(NaOH) = m(NaOH)/ V(Solution) = 4/0.25 = 16 g/dm³

Answer : The concentration of the solution is 16 g/dm³ .