Solutions and pH

Based on the solubility chart, which of the listed salts is the most soluble at 40°C?

• KCl
• KClO₃
• KNO₃
• Pb(NO₃)₂

What conclusion can be made using this solubility curve?

• Decreasing temperatures always increases solubility 
• Increasing temperatures always increases solubility
• Increasing temperatures usually increases solubility
• Temperature has no affect on solubility

 Which compound listed demonstrated the GREATEST increase of solubility as a result of an increase in temperature?

• KNO₃
• KCl
• NaCl
• KClO₃

Consider the salts represented on the solubility curves displayed as line graphs. In all cases the salts are which part of an aqueous solution?

• precipitate
• solvent
• solute
• concentrate

What property do all three of these common household substances have in common?

• they are all basic
• they taste sour
• they have a pH below 7
• they all turn litmus paper red

What does this solubility curve show?

• Solubility increases as temperature increases
• Solubility decreases as temperature decreases
• Solubility decreases as concentration increases
• Solubility is not affected by temperature

If you have a solution that is very acidic with a pH of 3.5, what can you do to raise the pH? 

• add more acid
• add more water
• increase the temperature
• add a base

When Sally tested an unknown substance, her red litmus paper turned blue but her blue litmus paper did not change color. What is the solution?

• Acid
• Base
• neutral
• world peace

Palmer puts 10 grams of salt in 100 grams of water. He then puts 50 grams of salt in 100 grams of water. Compare the concentrations of the two solutions

• both mixtures are acids
• both mixtures are bases
• the first solution is more diluted while the second one is more concentrated
• the first one is more concentrated while the second one is more diluted

According to the pH scale, which of the following would be true?

• baking soda is a weak base while drain cleaner is a strong base
• lemon is a weaker acid than a banana
• tomato and soap are acidic
• vinegar is less acidic than an apple