A molar solution of caustic soda is prepared by dissolving

Chemistry

JAMB 1984

A. 40 g NaOH in 100 g of water
B. 40 g NaOH in 1000 g of water
C. 20 g NaOH in 500 of solution
D. 20 g NaOH in 1000 g of solution
E. 2o g NaOH in 80 g of solution

WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now

WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now

Correct Answer: Option B

Explanation

A molar solution implies concentration in terms of moles/liter. The respective atomic weights for NaOH are: Na - 23,0 - 16 and H - 1, so the molecular weight, is 23 + 16 + I = 40. Thus 40 grams of NaOH equals one mole of NaOH, and a 1 molar solution of NaOH will contain 40 grams of NaOH chemical in 1000grams of water.

Previous Next

Go back to Chem classroom

Report an Error Ask A Question Download App