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Assuming equal concentrations, rank these solutions by pH. Highest pH (1) to lowest pH (5) CaBr2...

Assuming equal concentrations, rank these solutions by pH. Highest pH (1) to lowest pH (5)

CaBr2 (aq) CH3NH3Br (aq) HCl (aq) RbOH (aq) K2CO3 (aq)

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Answer #1

low pH -- > acidic

high pH -> basic

CaBr2 (aq) = Ca2+ + Br- ions will be neutral, pH = 7

CH3NH3Br (aq) --> slightly acidic sicne CH3NH3+ = CH3NH2 + H+ is formed, pH = 4-5 approx

HCl (aq) --> pH is low, since strong acid, pH = 1-3

RbOH (aq) --> pH is high, since strong base --> pH = 12-14

K2CO3 (aq) --> this is a weak base, 2K + CO3-2 --> CO3-2 + 2H2O <-> H2CO3 + OH-

then, pH = 9-11

therefore order

HCl < CH3NH3Br < CaBr2 < K2CO3 < RbOH

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