How to change pH 8 (30.0-mL) to PH 6 and 6.5 with pH 5 stock solution?

how much pH5 solution do i need to add if i want to change pH 8 solution (30-mL) to pH 6.0 with pH5 stock solution



show your calculations too thanksHow to change pH 8 (30.0-mL) to PH 6 and 6.5 with pH 5 stock solution?
Well, this would depend on the concentration and chemical property of both the pH5 solution and the pH8 solution. Please provide VERY detailed case so others may help you.