Calculating pH and pOH 1. What is the poH of a 0.36 M solution of sodium hydroxide
(NaOH)?

2. Calculate the pH of a sodium hydroxide solution with a
pOH of 4.6

3. What is the pH of a substance that has a hydrogen ion
concentration of 6.9x10^-2 M?

catya your not at all which answer i've seen you do this on another question!

the answer is c

tell me if wrong

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