Demo 8: Water to Grape Juice to Milk

Water, Grape Juice

100

This is the color grape juice turns.

What is pink/purple?

200

Water is this type of solution, which is why phenolphthalein remain colorless.

What is a neutral solution?

300

Phenolphthalein changes to a pink color in this kind of environment.

What is a basic solution?

400

This is what NaOH dissociates into when added to the water, turning the solution basic.

What are OH- ions?

500

This is the mL amount we assumed each drop from the pipet to be.

What is 0.05 mL?

Lemonade

100

This is the color lemonade turns.

What is colorless?

200

This is where the moles of OH- in the solution came from.

What is the grape juice solution or NaOH?

300

0.0135mol H2SO4 was used. This is the number of moles of H+ after H2SO4 dissociated in water.

What is 0.0270 mol?

400

This is the salt formed by the neutralization reaction between H2SO4 and NaOH.

What is Na2SO4?

500

This is why the solution turned colorless after 9M H2SO4 was added. (Hint: It has to do with the color change of phenolphthalein.)

What is the neutralization of moles of OH-, with moles of H+ still remaining?

7-Up

100

This is the color of 7-Up.

What is colorless?

200

This is the number of grams of NaHCO3 used.

What is 1g?

300

This is what NaHCO3 dissociates into and what reacts with the H+ ions.

What is HCO3-?

400

This is why bubbles were formed in the 7-Up solution.

What is CO2?

500

This is why the 7-Up solution remained colorless. (Hint: It has to do with the color change of phenolphthalein).

What is moles of H+ remaining after reacting with HCO3-?

Milk

100

The color of milk.

What is white?

200

This is a property of precipitates that leaving them suspended in water.

What is insolubility?

300

This is the ion that reacted with SO₄^2- to form the precipitate.

What is Ba²⁺?

400

This is the precipitate that formed in milk.

What is BaSO₄?

500

These are the two molecules from which SO₄^2- ions came from.

What are Na₂SO₄ and H₂SO₄?

Pepto-Bismol

100

The color of Pepto-Bismol

What is pink?

200

0.036mol NaOH is used. How many OH- ions are present?

What is 0.036mol OH-?

300

This is what NaOH dissociates into to neutralize the moles of H+.

What are OH- ions?

400

This is why 6M NaOH solution was used. (Hint: Think about neutralization.)

What is the neutralization of H+ ions/acid?

500

This is why Pepto-Bismol turns pink.

What is moles of OH- remaining after neutralizing moles of H+?