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(a) In what order would the amino acids Arg, His, and Leu be eluted from a...

(a) In what order would the amino acids Arg, His, and Leu be eluted from a carboxymethyl column at pH 6?

(b) In what order would Glu, Lys, and Val be eluted from a diethylaminoethyl column at pH 8?

Can anyone show me step by step how to solve this? I don't understand how to find the charges of the amino acids and how pH affects it?

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