The concentration of Sn2 in a solution is determined by titrating it with a 0.1799 M Ce4 solution. The balanced net ionic equation for the reaction is: 2Ce4 (aq) Sn2 (aq)2Ce3 (aq) Sn4 (aq) In one experiment, 17.47 mL of the 0.1799 M Ce4 solution is required to react completely with 25.00 mL of the Sn2 solution. Calculate the concentration of the Sn2 solution. 0.06286 M

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answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol