Question

Q1: Write the chemical reaction for the following experiment below involving the synthesis of gold nanoparticles.

Procedure:

STEP 1: Solution A,B,C,D

Solution A: Take 0.1g of tannic acid and add 10 ml of dI water in a sample vial.

Solution B: Take 0.1g of tri-sodium citrate and add 10 ml of dI water in a sample vial.

Solution C: Take 0.552g of potassium carbonate and add 20 ml of dI water in a beaker to obtain 0.2 M stock solution. Take 12.5 ml of 0.2 M solution and bring it to 100 ml with dI -water.

Solution D: Take 0.1g of HAuCl4 and add 8.5 ml of dI water in a sample vial.

Preparation of 5 nm gold nanoparticles:

Solution 1: Take a 250 ml conical flask and add 1ml of Solution D followed by 79 ml of dI water. Heat to 600°C with stirring.

Solution 2: Take a 100 ml conical flask and add, solution B (4 ml) + Solution A (1ml) + Solution C (1 ml) + 14 ml dI water. Warm to 600°C

Mix Solution 2 to Solution 1 with continuous stirring.

Answer 1