Hypochlorous acid (HOCl) (bleach) is being used to disinfect hospital surfaces. The total concentration of OCl-containing species is 5 × 10-4 M. The bleach is more effective in the HOCl form than the OClform. Therefore, you are targeting to have 99% of the total OCl-containing species in the HOCl form and 1% as OCl- . What pH should you use to achieve these concentrations?

i don't know people like to fight everywhere rip.

i do not get it   at all

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

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