Question

For 3.0M NaOH solution:

A.Calculate the solution density (neglecting the volume contribution of NaOH)

B.Calculate the concentration of Na+in w/w%

C.Calculate the mass in grams of solid NaOH to prepare 250ml solution of 3.0M NaOH

Answer 1

DATE 3 M Naol solution A) 3M 3 mol/L le 3 mol, Naoh rin one Litre water Number Moles a Mass Molar Mass of Na oH НА uo Mass Нау g 120 solute Wate Nooh is 120g Density of I litre olky 1 ml g solvent Total solution - 120+100 Volume of 112og of solution 2 IL of solution = 10oom L Mass Volume solution 1120 1ooo - 1.12 g lm Iml B) wlwy. - 100 Weight of solution Hog Naon Naon Nat Izog contains 23 contains yo 234 Bo so g of Na

DATE: 69 g of Nat Weight of solution = 1120g WIwy 1120 6.16 % c) Molarity 3M Volume = 250 ml Molar Mass 8 Na OH- nog g/mol Molarity Mass Molal Mass Vol (mL) 3 Mass yo Mass = 30 250 Na on is vrequiredo