Calculate the concentration of standard solution, chemistry, Microeconomics

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1. A standard solution of potassium hydroxide (KOH) was prepared by dissolving 15g of KOH in 250.0mL of distilled water.
(a) Calculate the concentration of this standard solution. (2 marks)
(b) How many mL of the standard solution in part (a) above would be needed to make 200mL of a 0.05 mol L-1 solution? (1 mark)
(c) 20 mL of an unknown solution of HCl was titrated with 21.6 mL of the 0.05 mol L-1 solution of KOH from 9(b) above. What is the concentration of the unknown HCl solution?

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