Question

You are required to make 250 cm3 of a solution of

sodium hydroxide which has a concentration of
0.1 mol dm-3. What mass of sodium hydroxide would
you need to weigh out?
A 0.1 g
B 1.0 g
C 4.0 g
D 25.0 g​

Answer 1

b) 1.0g

Step-by-step explanation:

C=m

MV

where Cis concentration

m is mass of substance

M is molar mass

V is volume of substance

To find m

CMV=m

but M = 23+16+1

= 40

0.1×40×0.25=m

1.0=m