Conner is testing the pH of a swimming pool and he finds it to be 6.5. Optimal pH for swimming is between 7.0 and 7.6. Conner adds a compound to the pool and waits a few hours. He retests the pool water and finds the pH to be 7.2.
What did Conner do to raise the pH of the pool?
A) He added water to raise the pH.
B) He added a base to raise the pH.
C) He added a salt to raise the pH.
D) He added an acid to raise the pH.

the answer is 1 i believe

idk what is it? is this a question that you know the answer or u dont

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