Question

Double Replacement PLS HELP

This particular reaction is also known as a precipitation reaction where two aqueous
solutions come together and make an insoluble precipitate.
Fill a small test tube approximately one third full using distilled water from a wash bottle.
Water is not involved in the reaction so do not write water into the chemical equation for
this reaction.
Holding the end of the dropper just above the test tube, add five drops of aqueous lead nitrate to the test tube. To prevent contamination, you need to make sure that
touch the side of the test tube with the eye dropper.
Add two drops of aqueous potassium iodide to the same test tube and
10) Record your observations.
11) Write a balanced chemical equation for this reaction.
Pour the solution down the sink and make sure the sink stays clean.

Answer 1

Based on the instructions given, you are conducting a double replacement reaction between aqueous lead nitrate (Pb(NO3)2) and aqueous potassium iodide (KI). This reaction is known as a precipitation reaction.

Here are the steps to follow:

Fill a small test tube approximately one third full with distilled water from a wash bottle.

Add five drops of aqueous lead nitrate (Pb(NO3)2) to the test tube. Be careful not to touch the side of the test tube with the dropper to prevent contamination.

Add two drops of aqueous potassium iodide (KI) to the same test tube.

Observe and record your observations.

Based on the reactants involved, a reaction occurs between lead nitrate and potassium iodide, resulting in the formation of solid lead iodide (PbI2), which is insoluble in water. It will appear as a yellow precipitate.

The balanced chemical equation for this reaction is:

Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)

After observing the reaction, it is recommended to properly dispose of the solution by pouring it down the sink. Ensure that the sink stays clean to prevent any potential clogging or contamination issues.

VERY IMPORTANT: Always follow proper laboratory safety protocols and dispose of chemicals according to relevant guidelines.