What is the molar mass of homogentisic acid
A 5.96-g sample of homogentisic acid, a weak organic acid having Ka=4.0 x 10^-5, is dissolved in 35.0 mL of water and its pH is measured to be 2.20. What is the molar mass of homogentisic acid?
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Two samples of calcium flouride are decomposed into their constituent elements. The first sample produced 1.64 g of calcium and 1.56 g of flourine. If the second sample produced 294 mg of fluorine, how many g of calcium were formed?
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What is the hydronium-ion concentration of a buffer solution that is .25 M Na2HPO4 and .40 M NaH2PO4? For H3PO4, (Ka1=6.9x10-3), (Ka2=6.2x10-8) and (Ka3=4.8x10-13).
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