87mg of Ni_Salt

Lab Handout: 0.1 M Ni(NO3)2·6H2O Stock (100 mL) + 3 mol% Ni–ZnO Addition

Lab Handout: 0.1 M Ni(NO3)2·6H2O Stock (100 mL) & Nickel Addition for 3 mol% Ni–ZnO

Supervisor: Dr. Sibi K. S.  |  Batch volume: 100 mL stock  |  Use: 3 mol% Ni doping
Important practical note: Ni(NO3)2·6H2O is hygroscopic (absorbs moisture). It may look wet/semi-liquid if the bottle was open. For project work, avoid weighing tiny 87 mg directly—prepare a stock solution and pipette volume instead.

Part A — Calculation for 0.1 M Stock Solution (100 mL)

Given

  • Molar mass of Ni(NO3)2·6H2O, \(M_r\) = 290.8 g/mol
  • Required molarity, \(C\) = 0.1 mol/L
  • Required volume, \(V\) = 100 mL = 0.1 L

Formula

\(\text{Mass} = C \times V \times M_r\)

Substitution

\(\text{Mass} = 0.1 \times 0.1 \times 290.8 = 2.908\ \text{g} \approx 2.9\ \text{g}\)

Part B — Preparation of ~0.1 M Stock (Easy Project Method)

What to do (straight steps):
  1. Take a clean 100 mL beaker (or volumetric flask if available).
  2. Add ~60–70 mL DI water.
  3. Weigh 2.9 g (or 3.0 g for easy weighing) of Ni(NO3)2·6H2O using an electronic balance.
  4. Add the chemical to the water and stir until fully dissolved.
  5. Make the total volume exactly 100 mL by adding DI water.
  6. Mix well. Label as: ~0.1 M Ni(NO3)2·6H2O stock.
Note: If 3.0 g is used instead of 2.9 g, the stock is ~0.103 M (≈3% higher), acceptable for MSc project work.

Part C — Nickel Addition for 3 mol% Doping

Target nickel salt equivalent

Required solid equivalent: 87 mg Ni(NO3)2·6H2O

Use stock solution (recommended)

Add: 3.0 mL of 0.1 M Ni(NO3)2·6H2O stock solution
Then stir for 10 minutes.

Why 3 mL corresponds to ~87 mg (calculation check)

For 0.1 M stock: \(0.1\ \text{mol/L} = 0.0001\ \text{mol/mL}\)
So for 3 mL: \(n = 3 \times 0.0001 = 0.0003\ \text{mol}\)
Mass equivalent: \[ m = n \times M_r = 0.0003 \times 290.8 = 0.087\ \text{g} = 87\ \text{mg} \] Hence, the calculation is correct.

Safety

  • Ni(NO3)2·6H2O is an oxidizer and irritant. Wear gloves and goggles.
  • Avoid inhalation/skin contact. Clean spills immediately with plenty of water.
  • Close reagent bottle immediately after use.
Document use: MSc project / routine synthesis. For high-precision analytical work, use a volumetric flask and exact 2.908 g.

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