Calcium reacts with hydrogen gas at 300−400°C to form a hydride. This compound reacts readily with water, so it is an excellent drying agent for organic solvents.
(a) Write a balanced equation showing the formation of calcium hydride from Ca and H₂.
(b) Write a balanced equation for the reaction of calcium hydride with water (Figure 21.7).

Data given in Figure 21.7

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(a) The reaction of magnesium and acid. The products are hydrogen gas and a magnesium salt. Figure 21.7 150 ml 308 (b) The reaction of aluminum and aqueous NaOH. The products of this reaction are hydrogen gas and a solution of Na[Al(OH)4]. Producing hydrogen gas. (c) The reaction of CaH₂ and water. The prod- ucts are hydrogen gas and Ca(OH)2. Cangage Learning/Charles D. Winters