Question

After 11.2 g of carbon reacts with oxygen originally occupying 21.2 lit at 18⁰C & 750 torr, the cooled gases are passed through 3 lit of 2.5 M NaOH solution. Determine the concentration of NaOH remaining in solution which is not converted to Na₂CO₃.

Note: CO does not react with NaOH these conditions.

Answer 1

Mx(molarity. Or carbon reacting with oxygen)=11.2×21.2/44=5.4molal

Vx = vol. occupied by reacting C

My = molarity of NaOH

Vy = vol. of NaOH

M = molarity of resultant soln.

Mx×Vx+My×Vy=M(Vx+Vy)

M=5.04molal

Molarity of Remaining NaOH=5.04-2.5=2.54molal