The constituents slowly hydrate and the mineral hydrates solidify and harden. Antimonic acid exists only as the hydrate , forming salts as the antimonate anion . Deuterochloroform can be prepared by the reaction of sodium deuteroxide with chloral hydrate. It was considered to have superior sedative effects to both paraldehyde and chloral hydrate. During curing hydration occurs, allowing calcium-silicate hydrate (C-S-H) to form. Whereas the pH of a saturated morphine hydrate solution is 8.5, the salts are acidic. Or Pozzolanic reaction is also faster set chemical reaction of calcium silicate hydrate. Vivien was also addicted to the sedative chloral hydrate. These diols are stable when strong electron withdrawing groups are present, as in chloral hydrate. In 1832 produced chloral hydrate, the first synthetic sleeping drug. Her death was attributed to an overdose of the chloral hydrate. It is manufactured using 4-cyanopyridine and hydrazine hydrate. They also found indications of ammonia hydrate. It crystallizes from water as the hydrate. The hydrate of ethylene is ethanol.