Answer:
1.0489 M is the concentration (in M) of the NaOH solution that was added
Step-by-step explanation:
To calculate the concentration of acid, we use the equation given by neutralization reaction:

where,
are the n-factor, molarity and volume of acid which is

are the n-factor, molarity and volume of base which is NaOH.
We are given:

Putting values in above equation, we get:

1.0489 M is the concentration (in M) of the NaOH solution that was added