Exercises - Alkaline Earth Metals

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Chapter: Essentials of Inorganic Chemistry : Alkaline Earth Metals

Calcium supplementation is recommended as a dietary supplement especially for menopausal, pregnant or nursing women.


Exercises

 

1. Calcium supplementation

Calcium supplementation is recommended as a dietary supplement especially for menopausal, pregnant or nursing women. There are a variety of calcium salts on the market that can be used for oral administration. For the examples given below, determine the chemical formula, the molecular weight and the Ca2+ content (expressed in gram/gram (g/g) and percentage weight/weight (%w/w)).

(a)        Calcium carbonate

(b)       Calcium lactate

(c)        Calcium chloride

(d)       Calcium citrate

(e)        Calcium gluconate

 

2. Complete the redox equation (including the half-equations) and indicate the standard reduction potential assuming that both reaction partners are present in the same concentration.

(a)        Mg + Cl2 ??

(b)       Ba + Br2 ??

 

3. Complete the following redox equation (including the half-equations).

Mg + Cl2 ??

Indicate the standard reduction potential assuming a concentration of [Mg2+] = 0.7 mol/l and [Cl] = 0.8 mol/l.

 

4. Milk of magnesia

Milk of magnesia is typically an 8.7% w/v aqueous suspension of magnesium hydroxide.

(a)        What are the chemical formula and the molecular weight of magnesium hydroxide?

(b)       What is the concentration of magnesium hydroxide in gram per litre?

(c)        How many moles of such magnesium salts are present in a 100-ml suspension?

 

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