Question

19.

Caustic soda is 20 M NaOH and is olluted for household use. What is the household concentration of 10
mL of the concentrated solution is diluted to 500 ml?
(A) 0.4 M N OH
(B) 400 M NaOH
(C) 4 M NaOH
(D) 20M NaO

Answer 1

(A) 0.4M NaOH

Step-by-step explanation:

The 20M NaOH caustic soda is diluted from 10mL to 500mL, that is:

500mL / 10mL = Is diluted 50 times.

That means we can solve the new concentration of the diluted solution dividing the stock concentration (20M) 50 times:

20M / 50 = 0.4M NaOH is the concentration of the diluted NaOH solution.

Right answer is:

(A) 0.4M NaOH