Cobalt
Cobalt is a chemical element with the symbol Co and atomic number 27. Like nickel, cobalt is found in the Earth's crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gr…
Is cobalt chloride an acid or base or salt?
In the laboratory, cobalt (II) chloride serves as a common precursor to other cobalt compounds. Generally, aqueous solutions of the salt behave like other cobalt (II) salts since these solutions consist of the [Co (H ion regardless of the anion.
What does cobalt(II) chloride stand for?
Cobalt (II) chloride anhydrous (with no water molecules attached) Cobalt (II) chloride, also known as cobaltous chloride and cobalt dichloride, is a chemical compound. It contains cobalt in its +2 oxidation state. Its chemical formula is CoCl 2. It contains cobalt and chloride ions .
What is cobalt chloride paper in simple terms?
To meet the need for a simple method of measuring humidity in small spaces, a new method of using paper impregnated with cobaltous salts has been developed. Cobalt chloride paper is blue at low and pale red at high humidities, with a series of lilac colours between.
What colour does cobalt chloride give?
It is an unusual material in the way it changes colour, particularly in the presence of water. Anhydrous cobalt chloride, CoCl2, is blue in colour. As it absorbs water, it turns pink.
What substance is indicated by the cobalt chloride test?
Cobalt chloride is an indicator for water in desiccants, owing to the reversible hydration/dehydration coupled with distinct color change.
What does cobalt chloride indicate?
Definition of cobalt chloride : a chloride of cobalt especially : the dichloride CoCl2 that is blue when dehydrated, turns red in the presence of moisture, and is used to indicate humidity.
What to substances are indicated by the cobalt chloride and lime water test?
These substances are then drawn by the pump over a piece of cobalt chloride paper and through limewater, with changes indicating the presence of water and carbon dioxide respectively.
Is cobalt chloride an indicator?
The hexahydrate complex of cobalt chloride is pink in colour. Such distinct change in colour makes cobalt chloride useful as the humidity indicator in weather instruments. Therefore, the water turns the blue cobalt chloride paper into the pink.
Which of the following is an indicator of cobalt?
Cobalt chloride paper is used to test the presence of water through transpiration. When water is present, the colour of the cobalt chloride paper changes from blue to pink.
Why cobalt chloride is used to detect moisture?
As humidity increases, cobalt chloride gradually changes color from blue, to pink, to a lighter pink, almost white. The change in color is dramatic, and it makes this compound an excellent indicator of humidity.
What two substances are indicated by the cobalt chloride and lime water tests is it possible that other substances are produced when the candle burns?
-A cobalt chloride test indicates water is produced. -A limewater test indicates carbon dioxide gas is produced.
What substance is indicated by the limewater test?
Lime Water Test: Limewater is basically a solution of calcium hydroxide. So if we bubble carbon dioxide through the solution it reacts with calcium hydroxide solution to produce a white precipitate of calcium carbonate. We will observe that the limewater will turn milky or cloudy white.
What do the red colour of the cobalt chloride paper indicates?
Cobalt chloride paper is an indicator of moisture. It is blue in colour when dry and pink coloured when moist. Q. A blood red colour is obtained when ferric chloride solution reacts with _________.
How does cobalt chloride react with water?
It is an unusual material in the way it changes colour, particularly in the presence of water. Anhydrous cobalt chloride, CoCl2, is blue in colour. As it absorbs water, it turns pink.
What gas turns cobalt chloride pink?
Water vapour gas turns blue cobalt chloride paper light pink.
What colour is cobalt chloride solution?
The red colour of an aqueous solution of cobalt chloride is attributed to the ion [Co(H2O)6] and the blue colour with the same substance in presence of concentrated hydrochloric acid to the ion [CoCl4]".
How might cobalt chloride predict weather changes?
It works best in summer in areas with no air conditioning. When the air is dry, the strip is blue. As moisture in the air increases and the air become more humid, the strip gradually turns pink indicating that rain is likely on the way. Cobalt chloride paper is also used to test for the presence of water leaks.
How does cobalt chloride induced hypoxia?
Cobalt chloride (CoCl2) imitates hypoxia in vitro by stabilizing hypoxia-inducible factor-alpha (HIF-1α), which is the master regulator in the cellular adaptive response to hypoxia.
What do the red colour of the cobalt chloride paper indicates?
Cobalt chloride paper is an indicator of moisture. It is blue in colour when dry and pink coloured when moist. Q. A blood red colour is obtained when ferric chloride solution reacts with _________.
How does cobalt chloride change colour?
The cobalt chloride changes color because the salt in the solution dissociates into ions. Cobalt ions are hydrated in the solution and have a pink color. Adding concentrated hydrochloric acid to the solution changes the color of the solution to bluish-purple.
What does cobalt chloride paper test for?
Cobalt chloride paper tests for the presence of water. If water is present, cobalt chloride will change colors from blue to purple to pink. When testing for humidity, the experimenter can simply use cobalt chloride paper to detect airborne water particles. Cobalt chloride is an inorganic salt that is bright blue when it is not exposed to humidity.
Why is cobalt chloride pink?
When heated, wet cobalt chloride paper can turn back from pink to blue as the water molecules are burned off and the original crystalline structure of the chemical is restored. Named for a shade of blue, cobalt chloride in liquid or paper form is toxic when ingested.
