138k views
2 votes
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

2 Answers

5 votes
CaVa=CbVb
1×25=45y
Y=25÷45
Y=0.56
User Orges
by
7.8k points
4 votes

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.

User Libor
by
7.9k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.