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Rank the following compounds in order of decreasing acid strength using periodic trends

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Rank the following compounds in order of decreasing acid strength using periodic trends.

Rank the acids from strongest to weakest. To rank items as equivalent, overlap them.

HCl   H2S    HBr     BH3

PART B)

Without consulting the table of acid-dissociation constants, match the following acids to the given Ka1 values.

H2S     H2SO3      H2SO4

Kal = 1.7 x 10^-7

Kal = 1.7 x 10^-2

Kal = very large