Anhydrides, basic

The oxides of the Group 1 and Group 2 metals are sometimes referred to as basic anhydrides (bases without water) because of this reaction. The reaction with CaO is referred to as the slaking of lime it gives off 65 kj of heat per mole of Ca(OH)2 formed. A similar reaction with MgO takes place slowly to form Mg(OH)2, the antacid commonly referred to as Milk of Magnesia. ... 

Oxides of metals are sometimes called basic anhydrides because they react with water to produce basic solutions. Some examples of this type of reaction are the following ... 

XVII. Acidic Anhydride + Basic Anhydride — Salt... 

XVIII. Basic Anhydride + Acid —> Salt + Water... 

Many oxides of metals that have a +1 or +2 charge are called basic oxides (basic anhydrides), because they will react with acids. 

This approach emphasizes the acid- and basic-anhydride aspects of acid-base chemistry, certainly useful though often neglected. The Lux-Flood base is a basic anhydride ... 

In both calcium carbonate and magnesium carbonate, which may be formulated CaO-C02 and MgO-C02, we have the same acid anhydride, C02. The tenacity with which the basic anhydrides CaO and MgO hold this acid anhydride is a measure of their basic strength. Magnesium oxide is, therefore, less strongly basic than calcium oxide. 

Na20 + h2o — 2Na+ + 20H. A very characteristic reaction for metal oxides. Soluble metal oxides (like this one) are known as basic anhydrides because they dissolve in water to form basic solutions. You can also treat it like a double-replacement reaction. 

Thus only those ionic oxides that are insoluble in water are inert to it. Ionic oxides function, therefore, as basic anhydrides. When insoluble in water, they usually dissolve in dilute acids, for example,... 

Classify each of the folbwing basic anhydride, or neither ... 

Most metal oxides in which the metal ion has a 1+ or 2+ charge are basic anhydrides, and most nonmetal oxides are acidic anhydrides. In general, an... 

If water is added to a basic anhydride, the anhydride becomes a base. For example, barium oxide plus water yields barium hydroxide ... 

Acidic anhydrides can react directly with bases, and basic anhydrides can react directly with acids. The same salt is produced as would be produced by... 

An acidic anhydride and a basic anhydride can even react with each other in a combination reaction ... 

N2O5, SO3, and CI2O7 are nonmetal oxides and thus are acidic anhydrides CaO and K2O are metal oxides and therefore basic anhydrides N2O is neither. 

Which of these oxides are acid anhydrides and which basic anhydrides Wnte an equation for each representing its reaction with water. 

Species containing block elements with low oxidation numbers tend to have oxides that are basic anhydrides. 

Oxides of metals are called basic anhydrides (or basic oxides) because many of them combine with water to form bases with no change in oxidation state of the metal (Figure 6-8). Anhydride means without water in a sense, the metal oxide is a hydroxide base with the water removed. Metal oxides that are soluble in water react to produce the corresponding hydroxides. 

Figure 6-8 The normal oxides of the representative elements in their maximum oxidation states. Acidic oxides (acid anhydrides) are shaded red, amphoteric oxides are shaded purple, and basic oxides (basic anhydrides) are shaded blue. An amphoteric oxide is one that shows some acidic and some basic properties.

Another common kind of reaction of oxides is the combination of metal oxides (basic anhydrides) with nonmetal oxides (acid anhydrides), with no change in oxidation states, to form salts. 

Basic anhydride A metal oxide that reacts with water to form a base. 

Identify the basic anhydrides of the following metal hydroxides (a) NaOH, (b) MgfOHfy, (c) FefOHly, (d) A1(0H)3. 

Anhydrides differ, depending upon whether the oxygen is bonded to a metal or a nonmetal. Nonmetal oxides form acids when they react with water and are called acidic anhydrides. Metal oxides, on the other hand, react with water to form bases and are called basic anhydrides. In both of these reactions, water is an active reactant. Now, examine some examples of anhydrides. 

Basic Anhydrides and Making Your Garden Grow... 

Consider the oxides MgO and CO2. For each oxide, tell whether it is a basic anhydride or an acidic anhydride. Write an equation for each to demonstrate its acid-base chemistry. 

Acidic anhydrides are nonmetallic oxides that react with water to form acids. Basic anhydrides are metallic oxides that react with water to form bases. 

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