Answer to Question #274395 in Chemistry for Leah

Question

250 cm³ of sodium hydroxide solution(NaOH) contains 2g of NaOH. Calculate the mass concentration and molar concentration of this solution. (Show ALL working using all relevant statements and upload a picture of your answer. Make sure you write your final answers with the correct units for molar and mass concentration). R.A. M.s Na=23 O=16 H=1 1 dm³=1000cm³ 

Answer 1

1) Mass concentration of NaOH is: 2 / 250 x 1000 = 8 g / L

2) C_M = n / V

n = m / M

M (NaOH) = 40 g/mol

n (NaOH) = 8 / 40 = 0.2 mol

C_M (NaOH) = 0.2 / 1 = 0.2 M