Sodium hydride, NaH, is available commercially as a gray-white powder. It melts at800C

Chapter 4, Problem 4.43

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Sodium hydride, NaH, is available commercially as a gray-white powder. It melts at800C with decomposition. It reacts explosively with water and ignites spontaneouslyupon standing in moist air.(a) Write a Lewis structure for the hydride ion and for sodium hydride. Is your Lewisstructure consistent with the fact that this compound is a high-melting solid? Explain.(b) When sodium hydride is added very slowly to water, it dissolves with the evolution ofa gas. The resulting solution is basic to litmus. What is the gas evolved? Why has thesolution become basic?(c) Write an equation for the reaction between sodium hydride and 1-butyne,CH3CH2C#CH. Use curved arrows to show the flow of electrons in this reaction.

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