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The Ka for H2PO41- is 6.3 x 10-8. The Ka for HS1- is 1.3 x 10-13. Both are amphoteric substances.
a) What does amphoteric mean? Use H2PO41- to describe your definition.
b) Write an equation to show the reaction between H2PO41- and HS1-. You must explain your results.
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