Question

How many grams of NaOH are in a 225.0 mL sample of a 2.5 M solution of NaOH? (Molar mass of NaOH is 40.0 g/mol)

Answer 1

Answer

Approx. 4 g of NaOH.

Explanation:

Concentration

 

=

 

Moles

Volume of solution

Number of moles

 

=

 

Volume

×

concentration  

=

0.250

⋅

L

×

0.400

⋅

m

o

l

⋅

L

−

1

=

 

0.100

⋅

m

o

l

Mass of sodium hydroxide

 

=

 

0.100

⋅

m

o

l

×

40.0

⋅

g

⋅

m

o

l

−

1

=

?

?

⋅

g

Explanation: