What volume of water must be added to `500 ml NaOH` to make `2%` (w/v) NaOH

Options

A. `5000 mL`
B. `6000 mL`
C. `5500 mL`
D. `6500 mL`

Answer

C

Explanation

Moles of `NaOH = 0.5 xx 6 = 3` mole
`= 3 xx 40`
`= 120 gm`
`2% ((w)/(v)) NaOH`
`(120)/(V) xx 100 = 2`
`V = 6000 mL`
Volume added `= (6000 - 500) mL`
`= 5500 mL`