Practice Exam 2

# Practice Exam 2 - Practice Exam 2 1 If you need 1.00 L of...

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Practice Exam 2 1) If you need 1.00 L of 0.125 M H 2 SO 4 , how would you prepare this solution? A) dilute 36.0 mL of 1.25 M H 2 SO 4 to a volume of 1.00 L B) dilute 20.8 mL of 6.00 M H 2 SO 4 to a volume of 1.00 L C) add 950. mL of water to 50.0 mL of 3.00 M H 2 SO 4 D) add 500 mL of water to 500 mL of 0.500 M H 2 SO 4 E) dilute 10.0 cm 3 of 1.25 M H 2 SO 4 to a volume of 1.00 L 2) What are the ion concentrations in a 0.24 M solution of Na 3 PO 4 ? A) [Na + ] = 0.24 M and [PO 4 - ] = 0.24 M B) [Na + ] = 0.060 M and [PO 4 - ] = 0.18 M C) [Na + ] = 0.080 M and [PO 4 - ] = 0.24 M D) [Na + ] = 0.12 M and [PO 4 - ] = 0.12 M E) [Na + ] = 0.72 M and [PO 4 - ] = 0.24 M 3) How many grams of solute are there in 100. mL of a 1.023x10 -3 M solution of Na 3 PO 4 (molar mass = 163.94 g/mol) A) 16.8 g B) 0.0168 g C) 1.00x10 -4 g D) 0.168 g E) 1.68 g 4) Acid – base titrations are an important method of chemical analysis. You use 32.45 mL of HCl to titrate 2.050 g of Na 2 CO 3 (molar mass = 105.989 g/mol) according to the equation Na 2 CO 3 (aq) + 2HCl(aq) 2NaCl(aq) + CO 2 (g) + H 2 O(l) What is the molarity of the HCl? A) 0.00119 M B) 2.384 M C) 1.192 M D) 0.596 M E) cannot be calculated based on the provided information 5) Nickel(II) chloride can be made by an exchange reaction between the metal carbonate and an acid NiCO 3 (s) + 2HCl(aq) NiCl 2 (aq) + CO 2 (g) + H 2 O(l) If you begin with 2.37 g of NiCO 3 (molar mass = 118.7 g/mol) and 500.00 mL of 0.125 M HCl, what is the theoretical yield of NiCl 2 (molar mass = 129.6 g/mol)?

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Practice Exam 2 - Practice Exam 2 1 If you need 1.00 L of...

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