Unit 5 Solutions Acids and Bases

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

• KCl
• KClO₃
• KNO₃
• Pb(NO₃)₂

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

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

Tags

NGSS.HS-PS3-4

 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

Tags

NGSS.HS-PS1-5

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 increases

• 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

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

Which characteristics describe a base?

• sour, indicator turns red, pH less than 7, produces hydrogen ions (H⁺)
• bitter, slippery, indicator turns blue, pH greater than 7, produces hydroxide ions (OH^-)
• neutral, pH of 7
• sour, indicator turns red, pH greater than 7