Question

The pH value of a solution containing 3% by mass of formic acid (ρ = 1.0049 g cm^-3) is equal to 1.97. 

How many times should the solution be diluted to attain a tenfold increase in the value of ionisation degree? 

Relative atomic masses: A_r(H) = 1.01; A_r(C) = 12.01; A_r(O) = 16. 

Answer 1

Calculation of c₂ after dilution (two alternative solutions):  

(a) α₁ – before dilution; α₂ – after dilution