what is the basicity constant and how is it calculated?

In the short answer section, question 6: "the value in JKmol-1 of deltaH for the reaction written is asked for. Where is this knowledge supposed to come from? Is this part of a num …

why electrolytes they migrate to the anode to carry charges?

I think it's S2O32- + 6H+ + 4e- -> 2S + 3H20 S2O32- + H20 -> 2SO2 + 2H+ + 4e- Which one's the oxidation and which is reduction? Do we need states in half equations? Also, sho …

In a secondary cell the products of the discharge reaction stay in contact with the electrode. Hence, by adding electricity to them you can recharge them. In normal store batteries …

NOT 5x10^-4 as I had thought. Why is this? The actual answer is 5x10^-8

I do not understand the rationale behind each dot point under step two of this excerpt from an experimental method. Would someone be able to explain about how this relates to conta …

s203 ^2- + 2H+ <---> S + SO2 + H2O That is an equation given in my prac booklet at school. We are asked to write the half equations for the reaction. Isn't that above reac …

Has anyone done the "blackout" prac before, or know of it? I'm doing it at school and I don't understand the rationale of it. Doesn't the whole equilibirum thing screw up the ch …

If we have 2L of pH 2 vinegar, and we want to make it pH 3, how much water do we add and why?

Lithium metal is prepared by electrolysis of a molten mixture of Lithium Chloride and Potassium Chloride, write the half equations for the reactions occurring at the cathode and an …

What do electrolytes do in batteries/cells?

This question was inspired from a past exam paper. See exam-spoiler for more questions of this type. In the 2008 unit 4 Chemistry exam, there was a question which asked: W …

This question was inspired from a past exam paper. See exam-spoiler for more questions of this type. Can you determine the acidity constant with only the pH of different acids …

Zinc-Carbon dry cells are considered primary cells, thus non-rechargable. Meanwhile, they can 'recover' from polarisation and continued to be used indefinately, unless they are let …