Solutions
Acid/Base
Concentrations
Solubility Curves
pH
100
What are the two parts of a solution?
Solvent and Solute
100
If I am tasting a substance that is acidic, how would it taste?
Acids are sour, bases are bitter.
100
How do you calculate concentration (molarity)?
Molarity = moles/Liters
100
What is a solubility curve used for?
To demonstrate how much of a solute you can dissolve in water a certain temperatures.
100
What does the pH scale measure?
The acidity of a substance.
200
I am mixing honey in some tea. Which substance is the solute?
The honey.
200
What happens when an acid and base react?
They neutralize.
200
Table salt has a solubility of 36g per 100 mL of water at 20°C. How much salt would have to be added to 200 mL of water at 20°C to make a saturated solution?
72g
200
What is the difference between unsaturated, saturated, and supersaturated?
Unsaturated=below the line
200
How many more times is a pH of 6 more acidic than pH of 7
10 times more acidic
300
True/False
When the temperature of the solvent increases, the amount of solute that I can add also increases.
True
300
What two substances are created in a neutralization reaction?
Water + Salt
300
If I dissolve 3 moles of NaCl in 3 Liters of water, what is my concentration?
1 M
300
I'm trying to dissolve 110g of NaNO3 in 100mL of water. If I complete this at 30o C, what type of solution do I have?
Supersaturated.
300
What ion makes acids acidic?
Hydrogen ion (H+)
400
I am making a salad. I cut up onions, lettuce, tomatoes, and cucumbers and putting them into a bowl. I sprinkle in some salt and pepper. Then I add my salad dressing. Is the salad a solution? Why?
No, it is a mixture but not a solution. There is no solvent or solute (nothing is being dissolved).
400
H2CO3 and NaOH
Identify the acid and the base.
H2CO3 (acid) and NaOH (base)
400
The molar mass of NaCl is 58g/mole. If I dissolve 29g in 1 L of water, what is my concentration?
29g/(58g/mole)= 0.5 moles
0.5 moles / 1 L = 0.5 M
400
What types of compounds (state of matter) decrease in solubility as temperature increase?
Gases
400
DOUBLE POINTS
What is the pH of water and explain why?
The pH of water is 7, making it neutral. When a substance has a neutral pH, there is an equal amount of H+ and OH-.
500
Last week when we did the lab of dissolving Magnesium Nitrate into water, we were heating the solution and seeing at what temperature the crystals started forming. What did we call the crystals forming in our solution?
Precipitate
500
HCl + Na(OH) -> ______ + _______
Fill in the formula for the products made in this reaction.
H(OH) + NaCl
500
If 250 g of CaCO3 is dissolved in 1.5 L of water, how many moles were dissolved?
molar mass CaCO3 = 100g/mole
250g/(100g/mole)= 2.5 moles
500
Which two compounds can dissolve the same amount at the same temperature?
Answers vary
500
The pH of completely neutral water is 7. However, it is healthier to drink some water brands because they help to counteract the toxicity in your blood. Explain what pH of water is better for you.
Toxins in your blood make the pH lower than 7 (acidic). To counteract this, it is better drink brands like Essentia that sell water at a pH of 9.5 to help clean your blood bring the pH up.