A typical vitamin C tablet (containing pure ascorbic acid, H2C6H6O6) weighs 500 mg. One vitamin C tablet is dissolved in enough water to make 170.0 mL of solution. Calculate the pH of this solution. Ascorbic acid is a diprotic acid. For H2C6H6O6, Ka1 = 7.9×10-5 and Ka2 = 1.6×10-12

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l

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