Q. What type of reaction is copper sulfate and iron?
single displacement reaction
Q. What type of reaction is heating CuSO4 5h2o?
Students remove the water of crystallisation from hydrated copper(II) sulfate by heating.
Q. What type of reaction is CuSO4 and NaOH?
double displacement reaction
Q. What happens when you mix copper II sulfate and sodium hydroxide?
The reaction between copper(Il) sulphate and sodium hydroxide solutions is a good place to start. If you slowly add one to the other while stirring, you will get a precipitate of copper(II) hydroxide, Cu(OH)2.
Q. Will sodium hydroxide dissolve copper?
alkaline electrolyte (KOH or NaOH), which has been done by many groups. However, I discover that copper somehow “dissolves” in 1 M NaOH. It looks like there is some kind of reactions happening between copper metal and NaOH.
Q. What do you observe when sodium hydroxide is added to copper sulphate solution?
pale blue precipitate
Q. What is the Colour of copper sulphate solution?
blue color
Q. What happens when you heat copper hydroxide?
Heating copper hydroxide produces copper oxide, CuO, a black solid. Copper oxide dissolves in acid, regenerating the copper (II) ion, which once again binds to water.
Q. What is the observation when sodium hydroxide solution is added in a small amount to the aqueous salt solution of copper II sulphate?
1 Answer
| Aqueous salt solution | Colour of precipitate when NaOH is added in a small quantity. | Nature of precipitate (soluble or insoluble) when NaOH is added in excess. |
|---|---|---|
| Copper (II) sulphate | Blue | Insoluble |
| Zinc nitrate | White | Soluble |
| Lead nitrate | White | Soluble |
| Calcium chloride | White | Insoluble |
Q. What happens when copper sulphate reacts with zinc?
Answer: When zinc is added to copper sulphate (CUSO4) solution due to more reactivity of zinc, cooper is replaced by the zinc and forms zinc sulphate. During the process, the colour of the solution changes from blue to colourless.
Q. What is observed when sodium hydroxide solution is added first in small amount and then in excess in zinc sulphate solution?
Thus, the white precipitate of zinc hydroxide is soluble in sodium hydroxide. Thus, when sodium hydroxide is added drop wise until in excess to a solution of zinc sulphate it is observed that white precipitate is formed which is soluble in excess of sodium hydroxide.
Q. What happens when sodium hydroxide solution is added to calcium iodide solution?
A few drops of dilute sodium hydroxide solution react to form a white precipitate with aluminium ions, calcium ions and magnesium ions. However, if excess sodium hydroxide solution is added: the calcium hydroxide precipitate is unchanged.
Q. What forms a white precipitate with hydrochloric acid?
A white precipitate of barium sulfate forms if sulfate ions are present. The hydrochloric acid is added first to remove any carbonate ions that might be present – they would also produce a white precipitate, giving a false positive result. Barium nitrate solution can be used instead of barium chloride solution.
Q. What acid is used to clean the Nichrome loop between tests?
make a small loop in the end of a clean nichrome wire. dip the loop into concentrated hydrochloric acid and then into the sample.
Q. How do you identify Pb2+?
Tests for Cations Note that Al3+ and Pb2+ can be distinguished by adding aqueous potassium iodide (KI). If Pb2+ is present, a bright yellow precipitate of lead (II) iodide (PbI2 ) will be formed. H+ (acid) can be identified by adding carbonate. Carbon dioxide gas will be produced.
Q. What property is used as the basis for the separation of copper subgroup from the tin subgroup?
Facts: The sulfides of Arsenic, Antimony, and Tin(IV) are soluble in a solution of Ammonium Sulfide. The sulfides of Copper, Lead, Mercury, Bismuth, and Cadmium are insoluble. This fact is the basis for the separation of the Copper subgroup from the Arsenic subgroup.
Q. What is the Colour of Cu 2 ion?
blue
Q. Which ion’s precipitate when HCl is added?
If any lead ion is present, addition of cold HCl solution to the liquid will cause white lead chloride to precipitate.
Q. What can you conclude if no precipitate forms when added with HCl?
If HCl is poured on an unknown substance and no precipitate forms it can be concluded that the substance is not a base or an alkaline substance. HCl is an acid and acids and bases always react to form a salt and water.
Q. Why pbcl2 is insoluble in dilute HCl?
Zinc is more reactive than hydrogen, as the reactivity series says. Therefore, zinc can displace hydrogen from the HCl and form its soluble chloride, that is, zinc chloride (ZnCl2). This will take place only if the HCl acid is dilute. When it is dilute, then only it will have the water in which ZnCl2 dissolves.
Q. Which anion will form a precipitate with Al3+?
Most metal ions react with aqueous OH1-, hydroxide ion, to form gelatinous precipitates of the metal hydroxides. For example, Al3+(aq) reacts to form Al(OH)3(s).
Q. What is the name of the ion Al3+?
aluminum cation
