Na2CO3 Sodium carbonate

Sodium carbonate decahydrate, Na2CO3-10H2O, was once widely used as washing soda. It is still sometimes added to water to precipitate Mg2+ and Ca2+ ions as carbonates, as in... 

Sodium carbonate is often supplied as the decahydrate, Na2CO3-10H2O. What mass of this solid should be used to prepare 500. mL of 0.135 M Na2C03(aq) ... 

If you wish, you can remove some of these ions (mainly Ca2+(aq), Mg2+(aq), and Fe2+(aq)) yourself. For relatively small volumes of water (such as enough to fill a bathtub or a washing machine), you can add sodium carbonate decahydrate, Na2CO3-10H2O. This compound is commonly called washing soda. It is an inexpensive way to add carbonate ion to the water. The carbonate ions precipitate the unwanted ions. 

Deca- 10 Na2CO3 10H2O Sodium carbonate decahydrate... 

Determine the mass percent of anhydrous sodium carbonate (Na2C03) and water in sodium carbonate decahydrate (Na2CO3 10H2O). 

Sodium carbonate exists in various crystalline forms with different amounts of water of crystallization, including Na2C03, Na2CO3 10H2O, and others. The water of... 

An aqueous solution of sodium carbonate, Na2C03, is titrated with strong acid to a point at which two H ions have reacted with each carbonate ion. (a) If 20.0 mL of the carbonate solution reacts with just 40.0 mL of 0.50 M acid, what is the molarity of the carbonate solution (b) If the solution contains 5.0 percent by mass sodium carbonate, what is the density of the solution (c) Suppose that you wanted to prepare a liter of an identical solution by starting with crystalline sodium carbonate decahydrate, Na2CO3 10H2O, rather than with solid Na2C03 itself. How much of this substance would you need ... 

In the formula of a hydrate, the number of water molecules associated with each formula unit of the compound is written following a dot— for example, Na2CO3 10H2O. This compound is called sodium carbonate decahydrate. In the word decahydrate, the prefix deca- means ten and the root word hydrate refers to water. A decahydrate has ten water molecules associated with one formula unit of compound. The mass of water associated with a formula unit is included in molar mass calculations. The number of water molecules associated with hydrates varies widely. Some common hydrates are listed in Table 10.1. 

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