Could you please explain how you arrived at the answer please, and how to determine the charge of each group. Thanks

What is the net charge of tyrosine at pH 7?

pKa of amino group: 9.2

pKa of carboxyl group: 2.2

pKa of side chain: 10.5

Germanium is an intrinsic semiconductor. When As, Ga, P, or Se is used to dope Germanium, state whether an n-type or p-type semiconductor is formed?

Note: Please explain in details on how you arrived at the answer.

Draw all likely products for the following reactions. (ORGO CHEM II)

If possible can you please show how you arrived at the answers, thank you.

Calculate the pH during the titration of 40.0mL of 0.01000 M HCIwith 0.1000 M NaOH solution after the following additions ofbase:
a)________23.00mL
b)________39.70mL
c)________48.00mL


Please clearly explain how you arrived at the answer, just learningthis for the first time.