Calculating the concentration of HCL?

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Dmx D

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I have been provided with an approx, which is 1.0M and I have to calculate the exact concentration of HCL.

I carried out a thermometric titration.
In the experiment I had to add 50cm3 of HCL to a burette and place a conical flask containing 25cm3 NaOH below it. I had to add the HCL at 5cm3 intervals to the NaOH and measure the temperature using a thermometer.

I found out that 27.50cm3 of HCL neutralised the NaOH.

And now I have to calculate the exact concentration of HCL.

How do I do this?

Thank you!
 
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