http://www.xtremepapers.net/CIE/Cambrid ... 4_qp_1.pdf
How do you get the answer to Question 24, related to concentration, in the above paper?
How do you get the answer to Question 24, related to concentration, in the above paper?
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Concentration
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Maybe he posted the wrong link or qst.
Alright.
The maximum temperature will be produced when all the acid and base react, which means for a complete reaction, 20cm cube of NaOH reacts with 30cm cube of HCl.
Moles of HCl = 2 x 30/1000 = 0.06
Molar ratio of HCl and NaOH s 1:1, so 0.06 moles of HCl react with 0.06 moles of NaOH.
Concentration of NaOH= 0.06/(20/1000) = 3 mol/dm cube.
The maximum temperature will be produced when all the acid and base react, which means for a complete reaction, 20cm cube of NaOH reacts with 30cm cube of HCl.
Moles of HCl = 2 x 30/1000 = 0.06
Molar ratio of HCl and NaOH s 1:1, so 0.06 moles of HCl react with 0.06 moles of NaOH.
Concentration of NaOH= 0.06/(20/1000) = 3 mol/dm cube.