please explain step by step :)

7. Draw all of the ionic species of arginine beginning with the fully protonated species and ending with the fully deprotonated species arranging each ionic species from that which would appear at very low pH (such as, pH1.0 ) to very high pH (such as pH14.0 ). Indicate the net charge for each ionic species. Calculate the pl (isoelectric point) for arginine. Refer to the pKa values provided on Table 2.1 at the end of this assignment. pl(isoelectricpoint=(pKa2+pKa3)/2= Terminal a-carboxyl group 3.1 Aspartic acid Clutamic acid Histidine 6.0 Terminal a-amino group 8.0 Cysteine 5H5 8.3 Tyrosine 10.0 Lysine Arginine 10.4 12.5