10. Phosphoric acid is a triprotic acid and has values of pKa1 = 2.12, pKa2 = 7.21, and pKa3 = 12.38 at 25 ºC. A student conducts a titration where 150 mL of 0.100 M NaOH(aq) is added to 100 mL of a 0.100 M H3PO4(aq) solution. i. Which species are present in large quantities in the solution at equilibrium at this point? ii. What is the pH of the solution?

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

the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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