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Concentration question

25.0cm³ of potassium carbonate is neutralised by 23.7cm³ of hydrochloric acid of 0.120M. Find the concentration of potassium carbonate.

equation:
K₂CO₃+ 2HCl --> 2KCl + H₂O + CO_{2

Here is the problem:

Do I go ahead and calculate the number of moles of HCl as:

(23.7 x 0.120)/1000

Or do I do:

M = mol/dm³
0.120 = mol / 0.0237}
Any assistance is greatly appreciated, thank you.