Chemistry Answers

Given the following reaction:

N2 (g) + 3H2 (g) → 2NH3 (g)

How would the rate of change for NH3 compare to the rate of change for N2?

1. What are buffers?

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2. Write equations to show the dissociation of the salts (i) ammonium chloride and (ii) sodium acetate.

I. __________________________________________________________________

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II. __________________________________________________________________

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3. Write equations to show the hydrolysis of the two salts named in Exercise 2.

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II. ________________________________________________________________

4. Calculate the pH of the ammonium chloride solution of concentration 0.1M if the acid dissociation constant/ hydrolysis constant for the NH₄⁺ ion is 5.8 x 10^-10

1 A substance that when dissolved in water increases the concentration of H ions is a/an ……….

2 What is the solubility product (Ksp ) expression? CaF2 (s) ⇌ Ca 2+(aq) + 2F -(aq)

3 What is the pH of 500 mL of solution containing 0.0124 grams of Ca(OH)2?

4 which reactions would increasing pressure at constant temperature not change the

concentrations of reactants and products, based on Le Chatelier's principle?

5 Fill in Each blank cell with the correct value

pH [H +] / M pOH [OH -] / M

2.3 ------------ --------- -------------

12.2 ----------- ---------- --------------

------- 5.1 × 10 -5 ------------- ---------------

-------- ----------- ------------- 7.9 × 10 -- 10

How many grams of CaSO4 (molar mass= 136.2g/m) can be produced from the reaction if 42.528 grams of CaBr2 is reacted with 42.39 grams of LiSO4?

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)

If 15.0 of phosphoric acid completely neutralizes 38.5mL of 0.150 mol/L sodium hydroxide, what is the concentration of the phosphoric acid

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the volume of a given mass of gas is 300cm³ at 27⁰c and 700mmhg what will be the volume at 35⁰c and 750mmhg

a voltaic cell is designed using the following reaction Zn+2Ag -zn 2+ + 2 Ag determine the standard voltage Eo for this reaction ?