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1.) 4.00 g of NaOH are dissolved in water to make 5.00 L of solution. What...

1.) 4.00 g of NaOH are dissolved in water to make 5.00 L of solution. What is the concentration of hydronium ions, [H3O+], in this solution?

Express your answer with the appropriate units.

2.) If you wanted to determine how much KOH (potassium hydroxide; a strong base) was dissolved in water, you could titrate it with a known amount of KHP (potassium hydrogen phthalate; a weak acid) until a color change indicates that the base is completely neutralized. The molecular equation below depicts this neutralization reaction.

KHP(aq)+KOH(aq)→K2P(aq)+H2O(l)

Write the net ionic equation that depicts the neutralization of the base KOH by KHP. Instead of using the entire chemical formula of phthalate, use HP− to represent the acidic hydrogen phthalate ion and P2− to represent the phthalate ion.

3.) A lactic acid/lactate ion buffer solution contains 0.37 M HC3H5O3 and 0.66 M C3H5O3−, respectively. The Ka value of lactic acid is 1.4×10−4. Calculate the pH of this buffer.

4.) Phosphorus-32 has a half-life of 14.0 days. Starting with 6.00 g of 32P, how many grams will remain after 112 days ?

Express your answer numerically in grams.

5.) Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C has decayed to 1/32.0 of the original amount. How long ago was this plant alive?

Express your answer numerically in years.

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