It may be prepared in the amorphous form by heating cobalt with sulphur dioxide, in a sealed tube, at 200° C. In the hydrated condition it is formed by the action of alkaline sulphides on cobaltous salts, or by precipitating cobalt acetate with sulphuretted hydrogen (in the absence of free acetic acid). [Please select]
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Acetate of lead is used in a similar way. [Please select]
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The cotton is first steeped in a bath of acetate of lead of about 10° Tw. [Please select]
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A bath of red liquor (acetate of alumina) at 8° Tw. [Please select]
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Crystallised acetate of soda contains 3 molecules of water of crystallisation, and is usually somewhat moist. [Please select]
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When dry this 'grey acetate' is the main source of all glacial acetic acid now made. [Please select]
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The watery solution which contains the coloring matter is then precipitated by neutral acetate of lead. [Please select]
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