Solution: What mass of HClO4 should be present in 0.600 L of solution to obtain a solution with each pH value?pH = 2.60

Problem

What mass of HClO4 should be present in 0.600 L of solution to obtain a solution with each pH value?

pH = 2.60

Solution

We are asked for the mass of HClO4 that should be present in a 0.600 L solution to obtain a pH value of 2.60. 

Remember that HClO4 is a strong, monoprotic oxyacid. It’s a strong oxyacid since there are 3 more O than H in the formula. 


Recall that strong acids completely dissociate in water and that acids donate H+ to the base (water in this case). The dissociation of HClO4 is as follows:


HClO4(aq) + H2O(l)  H3O+(aq) + ClO4(aq)


For strong acids, an ICE table is not necessary because it can be assumed that all of the acid or base will dissociate. 


The concentration of the strong acid is the same as its dissociated particles.


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