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[Cu(H2O)6]2+ is and octahedral shaped complex which I shall draw on the whiteboard.

It is blue for thw following reasons:

When the water ligands bond to the Cu2+ ion, it causes the d orbital...

A buffer solution is a solution which resists changes in pH when small quantities of acid or alkali are added to it. An example of a biological buffer system would be the bicarbonate buffer system (regula...

The initial [-OH] is 0.250M since NaOH releases 1 mole of -OH per mole of base. Using Kw=[H+][-OH], [H+]=(110^-14)/0.250=410^-14M (note remember units). Hence the initial pH=-...

H₂SO₄ ---> 2H⁺ + SO₄^{2-                                                                                                                                  ...}

Mass of the isotope/atom compared to 1/12th the mass of an atom of Carbon 12 (12C)