Which one of the following salts gives an acidic aqueous solution? NaH_2PO_4 KBr

Question

Which one of the following salts gives an acidic aqueous solution? NaH_2PO_4 KBr KCN KNO_3 Na_3PO_4 Which one of the following salts gives a basic aqueous solution? NaCH_3CO_02 KI NH_4Cl Fe(ClO_4)_2 RbNO_3 Which one of the following salts gives a basic aqueous solution? K_3PO_4 RbCl Ca(ClO_4)_2 NH_4ClO_4 CrCl_3 Which one of the following gives a neutral aqueous solution? NaNO_2 Cu(ClO_4)_2 Mg(ClO_4)_2 KF C_5H_5NH(ClO_4) Which one of the following 0.10 M aqueous solutions has the hi chest pH? HNO_2 KHCO_2 NaI NH_4I HI

Explanation / Answer

1.

NaH2PO4 in s olution

Na+ + H2PO4-

H2PO4- + H2O = HPO4- + H3O+; which is acidic , high on H+ ions

2.

NaCH3CO2; sinc ein solution Na+ and CH3CO2-

CH3CO2- + H2O = CH3COH + OH-; OH- is basic

3.

K3PO4 = 3K + PO4-3

PO4-3 + H2O = HPO4-2 + OH-; which is basic

4.

Cu(ClO2) and Mg(ClO2)

5.

the highest pH is the one that will be the most basic

then ignore HI, HNO2 since those are acids,

NaI will be neutral, NH4 will be acidic

KHCO2 --> K+ + HCO2-

HCO-2 + H2O = HCOH + OH-; this is the only BASIC; therefreo highest pH

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