help, i'd like to know how to do this titration question:

for example: a 1g sample of naoh contaminated with na2co3 is titrated with 0.500MHCl, and it is found that 46.5mL of HCl are required for neutralization. Find the percentage by mass Na2Co3.

thank you in advance

2 answers

Did you make this up from scratch? The numbers don't look right to me.
no, this is from my lab book. and furthermore, i am not able to solve it.