Textbook Question
Milk of magnesia, a widely used antacid, is an aqueous suspension of Mg1OH22. How would you prepare Mg1OH22 from magnesium metal?
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Ch.22 - The Main Group Elements
Chapter 22, Problem 78
Assign charges to the oxygen-containing anions in the following compounds: (a) Na2O (b) K2O2
Verified step by step guidance1
Identify the oxidation state of the metal in each compound. Sodium (Na) and potassium (K) are both alkali metals, which typically have an oxidation state of +1.
For Na2O, assign the oxidation state of sodium as +1. Since there are two sodium atoms, the total positive charge is 2(+1) = +2.
In Na2O, the compound must be electrically neutral. Therefore, the oxygen must balance the +2 charge from the sodium atoms. Assign the oxidation state of oxygen in Na2O as -2.
For K2O2, assign the oxidation state of potassium as +1. Since there are two potassium atoms, the total positive charge is 2(+1) = +2.
In K2O2, the compound must be electrically neutral. The peroxide ion (O2^2-) has a charge of -2, with each oxygen having an oxidation state of -1.
Related Practice
Open Question
Magnesium metal is produced by the electrolysis of molten magnesium chloride using inert electrodes. Predict the anode reaction, cathode reaction, and overall cell reaction.
Open Question
How many hours are required to produce 10.0 kg of magnesium by electrolysis of molten MgCl2 with a constant current of 1.00 * 10^4 A? How many liters of Cl2 at STP will be obtained?
Open Question
Assign charges to the oxygen-containing anions in the following compounds: (a) CsO₂ (b) BaO₂
Textbook Question
Identify the group 3A element that best fits each of the following descriptions.
(a) Is the most abundant element of the group
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Textbook Question
Identify the group 3A element that best fits each of the following descriptions.
(b) Is stable in the +1 oxidation state
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