What is the ph of 8.1x10^-5 m hclo4 solution

HCl04 is a strong acid solution. So, in theory everything dissociates.

pH= -log(0.000081)= 4.09

So what you would do is go through and add 3 teaspoons(tsp) 6 times because of the 6 tablespoons(tbsp). which will give you an answer of 18. another way is to multiply 3x6=18.

Anions are negative charged ions