Question

If it requires 25.0 milliliters of 1.0 molar HCl to neutralize 45.0 milliliters of NaOH, what is the concentration of the NaOH solution? Balanced equation: NaOH + HCl yields NaCl + H2O (3 points) Select one: a. 0.56 M NaOH b. 0.82 M NaOH c. 1.1 M NaOH d. 1.8 M NaOH

Answer 1

CaVa=CbVb
1×25=45y
Y=25÷45
Y=0.56

Answer 2

Answer: The correct option is a.

Explanation: We are given a balanced chemical equation for an acid-base reaction:

`NaOH+HCl\rightarrow NaCl+H_2O`

We need to find the concentration of base when it is neutralized by an acid.

For the neutralization reaction, we use the formula:

`M_1V_1=M_2V_2`

where,
`M_1\text{ and }V_1` are the molarity and volume of acid.

and
`M_2\text{ and }V_2` are the molarity and volume of base.

In the given question,

`M_1=1.0M\\V_1=25mL\\V_2=45mL\\M_2=?M`

Putting all the values, in above equation, we get

`1.0M* 25mL=M_2* 45mL`

`M_2=0.56M`

Hence, the correct option is a.) 0.56M NaOH.