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Neelam (Student) October 15 2016
The atomic number, Z, is the number of protons in the nucleus. The mass number ,A, is the total number of protons and neutrons in the atom.
Buffer solution is a system that minimises the change in pH when a small amount of acid or base is added. There are two types of buffer solutions- alkaline buffer solution and acidic buffer solution. The pH of alkaline buffer solution is always greater than 7, whereas the pH of acidic buffer solution is always smaller than 7.
In order to make alkaline buffer solution, weak base and its salt (chloride) must be mixed together, for example, ammonia and ammonium chloride. To prepare acidic buffer solution, weak acid and its salt must be mixed. For example, ethanoic acid and sodium ethanoate.see more
First, look at the Periodic Table. Potassium is in group 1 so has a +1 charge, Li+
Sulphates always have a -2 charge, SO4 2-
Now combine two ions together so we can get a neutral compound. We have +1 charge on Li ion and -2 charge on SO4 ion. Therefore, we need two Li+ ions for one SO4 2-
Now the charges cancel out and we have a neutral salt Li2SO4see more