Exactly 1.5g of soil is saturated with 100 ml of 1 m kcl. at the end of the saturation, the solution is analyzed, and the following results obtained: ca = 0.50 mg/l; mg = 1 mg/l; na = 1.5mg/l; al = 2 mg/l. if this represent all of the exchangeable ions that were initially on the soil, what is the cec and base saturation in men/100g?

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

you did not give any options thus this is the best answer i can give to you with this little information you have given

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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