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'The Relative Strength of an Unknown Acid' The aim of this experiment is to determine the relative strength of an unknown acid whose relative formula mass is 135. I am provided with the acid in as a white crystalline solid which is very soluble in water. The unknown acid monoprotic, which means for every one mole of acid, one mole of hydrogen is needed. The unknown acid can be completely neutralised by sodium hydroxide and the reaction is exothermic. The enthalpy change depends on the strength of the acid, so the stronger the acid, and the larger the enthalpy change. Therefore the weaker the acid, the smaller the enthalpy change. Below is a table with some typical values obtained by experiment. Acid Enthalpy change (kJ per mole of acid) HCl -57.9 HNO3 -57.6 CH2ClOOH -53.4 CH3COOH -50.1 HCN -38.2 To begin working out the unknown acids strength, I am going to use the enthalpy change equation (below) to work out the...

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