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Net Charge of Glycine, Aspartic Acid, Lysine, and Histidine

What is the approximate net charge, to the nearest integer value, of glycine, aspartic acid, lysine, and histidine at:
pH 1.0
pH 3.0
pH 5.0
pH 7.0
pH 12.0

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Hi there,

Thanks for letting me work on your post. Here is my explanation:

For glycine, pk1=2.34, pk2=9.6
at pH=1.0, the net charge is +1;
at pH=3.0, the net charge is 0;
at pH=5.0, the net charge is 0;
at pH=7.0, the net charge is ...