Question

1 M and 2.5 litres NaOH solution mixed with another 0.5 M and 3 litres NaOH solution. Then find out molarity of the resultant solution:

• A. 0.80 M
• B. 1.0 M
• C. 0.73 M
• D. 0.50 M

Answer 1

The correct option is C 0.73 M

1M and 2.5 L solution have 2.5 moles of NaOH

0.5 M and 3L solution have 1.5 moles of NaOH

total moles = 4

total volume = 5.5L

Molaity = $\frac{4}{5.5}=0.73M$