Qualitative analysis / by William Briggs and R.W. Stewart.

  • William Briggs
Date:
1913
Catalogue details

Licence: Public Domain Mark

Credit: Qualitative analysis / by William Briggs and R.W. Stewart. Source: Wellcome Collection.

    89/180 (page 73)
    5. Perric chloride, EeCl3, gives a white precipitate of ferric arsenate, EeAs04. EeCl3 + Na2HAs04 = EeAs04 + 2 NaCl + HC1. The precipitate is soluble in dilute mineral acids, but insoluble in acetic acid. 6. Copper sulphate, CuS04, gives a light blue precipitate of cupric hydrogen arsenate, CuHAs04. CuS04 + Na2HAs04 = CuHAs04 + Na2S04. AESENIOUS ACID, H3As03. Solution—Arsenious Oxide, As40G, dissolved in Hydro¬ chloric Acid, HC1. [.See Arsenic, page 32.] ALEMINATES. Solution—Potassium Aluminate, KA102, or Sodium Alumi- nate, HaA102. 1. Test with litmus. The solution is alkaline. 2. Cautiously add dilute hydrochloric acid. A white precipitate of aluminium hydroxide forms soluble in excess of acid and in caustic potash or soda. Eor equations see pp. 40, 41. The precipitate may be filtered off and part of it just dissolved in HC1 and Test 3 for aluminium (p. 41) applied; the other part is treated as in Test 4 <p. 41).