Question

50 ml of 1 N NaOH is mixed with 150 ml of 2 N
Ca(OH)2. The molarity of OH ions in the resulting
solution will be [Consider complete dissociation of
NaOH and Ca(OH)2]​

Answer 1

Answer:

Explanation:

Using Normality x volume we can get no. Of moles when Volume is in litres and millimoles when volume is in milli litre

Answer 2

Given:-

N1 = 1 N

N2 = 2 N

V1 = 50 ml

V2 = 150 ml

⇒ V = 200 ml

To Find :-

Molarity of OH ions, i.e., M

Using Normality equation, we have:

N × V = N1 × V1 + N2  V2

N × 200 = 1 × 50 + 2 × 150

N = 350/200

N = 1.75 N

We know that n = 1 for OH- ions and

N = n × M

⇒1.75 = 1 × M

⇒ M = 1.75 M