A 0.1401 g sample of pure carbonate was dissolved in 50.00 mL of 0.1140 M HCl and boiled to eliminate CO2. Back-titration of the excess HCl required 24.21 ml of 0.09802 M NaOH. Identify the carbonate, i. e. X in X(CO3)n.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.