Suppose you have a solution that might contain any or all of the following cations: ni2+, ag+, sr2+, and mn2+. addition of hcl solution causes a precipitate to form. after filtering off the precipitate, h2so4 solution is added to the resultant solution and another precipitate forms. this is filtered off, and a solution of naoh is added to the resulting solution. no precipitate is observed.

can you list the answers so i can answer

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