- #1

Gaunt101

- 8

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## Homework Statement

A swimming pool with 95000L of water with a pH of 8.9 needs to be lowered to a more suitable pH using an acidic substance. An ideal pH would be within the range of 7.2-7.6, so let's just assume that the pH we're hoping to achieve is 7.4. My brother chose trichlorocyanuric acid (TCA) as his substance to lower the pH, although I"m not entirely sure of the calculations involved since I've been unable to find a Ka value for TCA.

## Homework Equations

pH = -pKa + log([A-]/[HA-])

c = n/v

n = m/M

Ka = [A-][H+]/[HA-]

## The Attempt at a Solution

I assumed you would just use the first equation? I'm not entirely sure to be honest, the only way I can imagine doing this question is by assuming the Ka value of cyanuric acid and as a result you can the rearrange the first equation and solve for the concentrations of each species. Although I'm almost certain that this approach is incorrect. I'm terribly sorry I'm not particularly sure where to start.