Draw I he Lewis electron dot structure of NBr_3 Which one of the following compo

Question

Draw I he Lewis electron dot structure of NBr_3 Which one of the following compound is hygroscopic in nature Write the formula of the given Lewis structure The commercial name of copper sulphate is Complete the following equation: CuO + H_2SO_4 + .........rightarrow CuSO_4 5H_2O Write two uses of copper sulphate. The specific heat of solution of NaCI solution is 4.184 J/g Write net ionic equation of the following reaction NaOH + HCI rightarrow NaCl + H_2O The compound in a mixture that is less attracted to the solvent moves less and remains closer to the Initial spot in paper chromatography Determine R_f value of the given sample

Explanation / Answer

1) Lewis structure for NBr3: Step 1. The central atom for nitrogen tribromide is bromine

. Step 2. Place 1 pair of electrons between each adjacent pair of atoms to represent each bonding electron pair.

2)  A hygroscopic material is one which attracts moisture from the atmosphere.

If not protected from contact with the atmosphere (by being stored under vacuum or under a dry gas) some hygroscopic materials will eventually attract so much water that they will form solutions; such materials are normally termed deliquescent. Sodium hydroxide is one of the most common hygroscopic materials.

4

. Other names for copper(II) sulfate are "blue vitriol" and "bluestone".

This salt exists as a series of compounds that differ in their degree of hydration.

The anhydrous form is a pale green or gray-white powder, whereas the pentahydrate (CuSO4·5H2O), the most commonly encountered salt, is bright blue.

Copper (II) sulfate exothermically dissolves in water to give the aquo complex [Cu(H2O)6]2+, which has octahedral molecular geometryand is paramagnetic.

6)uses:

1)Copper sulfate can also be used as a mordant in vegetable dyeing. It often highlights the green tints of the specific dyes.

2) used asAnalyticalreagent:

Several chemical tests utilize copper sulfate. It is used in Fehling's solution and Benedict's solution to test for reducing sugars, which reduce the soluble blue copper(II) sulfate to insoluble red copper(I) oxide. Copper(II) sulfate is also used in the Biuret reagent to test for proteins.

Copper sulfate is also used to test blood for anemia.

The blood is tested by dropping it into a solution of copper sulfate of known specific gravity – blood which contains sufficient hemoglobin sinks rapidly due to its density, whereas blood which does not sink or sinks slowly has insufficient amount of hemoglobin.

3)Etching:

Copper sulfate is also used to etch zinc or copper plates for intaglio printmaking.It is also used to etch designs into copper for jewelry, such as for Champlevé.

5)In this reaction insoluble metal oxide(Cuo) is reacted with a dilute acid to form a soluble salt. Copper(II) oxide, a black solid, and colourless dilute sulfuric acid react to produce copper(II) sulfate, giving a characteristic blue colour to the solution. From this solution, blue copper(II) sulfate pentahydrate crystals may be obtained if desired.

This is a well-tried standard class experiment. It should take no more than 30 minutes to produce the filtered salt solution.

7) answer is true

the specific heat of the dilute NaCl solution to be 4.184 J/gK.

8)

NaOH + HCl --> NaCl + H2O

Net ionic eqn for aqueous solutions of NaOH & HCl is

H+(aq) + OH-(aq) ----> H2O(l)

Since Na+ and Cl- are spectator ions. They do not take participate in this reaction

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.