Question

What mass of sodium hydroxide (NaOH) is contained in 250cm3 of 0.02M sodium hydroxide solution?

Answer 1

Answer:

Approx.  

200

⋅

m

g

.

Explanation:

Concentration

 

=

 

Moles of solute

Volume of solution

.

And thus  

Moles of solute

=

Volume of solution

×

concentration

.

And thus  

Moles of NaOH

=

250

⋅

c

m

3

×

10

−

3

L

⋅

c

m

−

3

×

0.02

⋅

m

o

l

⋅

L

−

1

=

5.0

×

10

−

3

⋅

m

o

l

.

Mass

=

moles

×

molar mass

=

5.0

×

10

−

3

⋅

m

o

l

×

40.0

⋅

g

⋅

m

o

l

−

1

=

?

?

g