Other Chemistry Answers

4. A solution of HF contains 12 grams in 500.0mL. (5 marks)

a. Find [H+]. Make sure to show the ionization equation (with water)

. b. Calculate the pH of the above solution.

5. Predict the products of the following neutralization reactions (be sure to balance the equation and include states as well). (2 marks) a. HCl(aq) + Mg(OH)2(s)  b. H3PO4(aq) + KOH(s) 

A mixture of Al and Fe weighing 0.2000 g is treated with excess HCI solutions. Each metal reacts separately with the acid, resulting in the production of hydrogen gas H2, and a chloride salt. After treatment, a total volume of 200mL of the evolved gas was collected at 20 °C and 850 torr. Calculate for the mass percentage of Al in the sample.

How many moles of ethanol is produced if you start with 8.74 g of glucose

The half life of iridium is 12.8 years. Calculate decay constant and average life in minutes

Calculate for the specific heat of 28.0 g of of mercury (Hg)

when 137 J of energy is involved when raised at an initial

temperature of 22.0°C to a final temperature of 570C.

Balance the following redox reactions: (8pts, 4pts each)

              a) Cu (s) +  NO₃^- (aq)       à      Cu²⁺(aq)     +  NO (g)        (acidic medium)

Oxidation Half Reaction:

Reduction Half Reaction:

Net Reaction:

              b)  MnO₄^- (aq) +  NO₂^-(aq)        à   Mn²⁺ (s)   +  NO₃^- (aq)     (basic medium)

Oxidation Half Reaction:

Reduction Half Reaction:

Net Reaction:

Treatment of a 0.25000-g sample of impure potassium chloride with an excess of AgNO3 resultion of 0.2912g of AgCl. Calculate the percentage of CCl in the sample.

a. A gas occupies a volume of 400 cm3

at a pressure of 2.00 atm.

What would be the new pressure if the volume is increased to 500 cm3 ?

13. If 23 grams of formic acid, HCOOH, are dissolved in 10L of water at 25oC, the [H+] is found to be 3.0x10-3 M. Determine the Ka for HCOOH. Hint: think ICE BOX. (6 marks)

11. Calculate [OH- ] ions in a 0.125 M solution of nitrous acid. Is this solution acidic or basic; how do you know? Make sure you include the ionization equation. (6 marks)

12. Calculate the [H3O+] in a 2.00 L solution of NaOH, a strong base, if it contains 0.800 g of solute. Is this solution acidic or basic; how do you know? Make sure you include the dissociation equation. (6 marks)