The pH of a particular raindrop is 5.6.
(a) Assuming the major species in the raindrop are H2CO3(aq), HCO3-, and CO32-(aq), calculate the concentrations of these species in the raindrop, assuming the total carbonate concentration is 10 × 10-5 M. The appropriate Ka values are given in Table 16.3.

(b)What experiments could you do to test the hypothesis that the rain also contains sulfur-containing species that contribute to its pH? Assume you have a large sample of rain to test.

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Name Ascorbic Carbonic Citric Oxalic Phosphoric Formula Ka2 Ka3 8.0×10-5 1.6×10-12 4.3 x 10 5.6 x 1011 7.4 × 10-4 1.7×10-5 4.0 × 10-7 5.9×10-2 6.4 x 10-5 7.5 x 103 6.2 x 104.2 x 10-13 1.7×10-2 6.4 x 10-8 Large 1.0 X1034. 105 H2COs H2C204 Нзро, H2SO3 H2SO4 ulfurous Sulfuric Tartaric 1.2 x 02