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2. Chromate and dichromate - Wikipedia

   en.wikipedia.org/wiki/Chromate_and_dichromate

   The hydrogen chromate ion, HCrO 4 −, is a weak acid: HCrO − 4 ⇌ CrO 2− 4 + H +; pK a ≈ 5.9. It is also in equilibrium with the dichromate ion: 2 HCrO − 4 ⇌ Cr 2 O 2− 7 + H 2 O. This equilibrium does not involve a change in hydrogen ion concentration, which would predict that the equilibrium is independent of pH.

3. Chromate - Wikipedia

   en.wikipedia.org/wiki/Chromate

   Chromate and dichromate, ions; Monochromate, an ion; Trichromate, an ion; ... Monochromacy (monochromate) having one color vision; Dichromatism (dichromate) having ...

4. Color of chemicals - Wikipedia

   en.wikipedia.org/wiki/Color_of_chemicals

   The color of chemicals is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy performed by the chemical. The study of chemical structure by means of energy absorption and release is generally referred to as spectroscopy .

5. Silver chromate - Wikipedia

   en.wikipedia.org/wiki/Silver_chromate

   Example of Mohr argentometric titration near the endpoint: note the characteristic brick-red colour appearing due to silver chromate formation. The reactivity of the chromate anion with silver is lower than with halides (e.g. chlorides) so that in a mixture of both ions, only silver chloride precipitate will form: [9] AgNO 3(aq) + Cl − (aq ...

6. Potassium chromate - Wikipedia

   en.wikipedia.org/wiki/Potassium_chromate

   Potassium chromate is the inorganic compound with the formula K 2 CrO 4. ... It is used in qualitative inorganic analysis, e.g. as a colorimetric test for silver ion.

7. Lead(II) chromate - Wikipedia

   en.wikipedia.org/wiki/Lead(II)_chromate

   Lead(II) chromate can be produced by treating sodium chromate with lead salts such as lead(II) nitrate or by combining lead(II) oxide with chromic acid.. Related lead sulfochromate pigments are produced by the replacement of some chromate by sulfate, resulting in a mixed lead-chromate-sulfate compositions Pb(CrO 4) 1−x (SO 4) x.

8. Nickel(II) chromate - Wikipedia

   en.wikipedia.org/wiki/Nickel(II)_chromate

   Nickel chromate is dark in colour, unlike most other chromates which are yellow. [3] The infrared spectrum of nickel chromate show two sets of absorption bands. The first includes lines at 925, 825, and 800 cm −1 due to Cr-O stretching, and the second has lines at 430, 395, 365 (very weak) due to Cr-O rock and bend and 310 cm −1 produced ...

9. Chromium(VI) oxide peroxide - Wikipedia

   en.wikipedia.org/wiki/Chromium(VI)_oxide_peroxide

   Hydrogen atoms bonded to carbon atoms are omitted. Color code: Cr = gray, C= black, H = white, O= red, N = blue. Chromium(VI) oxide peroxide is formed by the addition of acidified hydrogen peroxide solutions to solutions of metal chromates or dichromates, such as sodium chromate or potassium dichromate. The generally yellow chromates or orange ...