Hi all, Number 79 page 145 After filtering out excess solid, a student adds HCL to Solution 1 in Table 1. He then adds a small amount of CaSO4, which dissolves completely. Which of the following also occurs in the new solution? The answer is B) Undissociated HIO3 increases when the HCL is added. Some additional info that you guys might want to know is that Solution 1 is saturated. Why is it that when you add HCL (which dissociates to H+ and Cl-) it increases the amount of saturation possible? I thought Solution 1 was already saturated, so anything added to it would fall out of solution? Hmmm, I think I may have just answered my own question. Is it because 1) when you add more HCL you have to add it in liquid amounts (you can't just add HCl, you have to add it in a liquid form) 2) With the reaction H+ (+) IO3- -><- HIO3, you cannot achieve saturation. Is this because there is no way for solid to occur? Because you're always adding more liquid if you're adding more acid (or base).