Acids/Bases Solubility

Unsweetened chocolate has a very bitter taste. What does this taste indicate about some of the compounds in unsweetened chocolate? 

• They are acidic. 
• They are basic. 
• They are neutral. 
• They are salts. 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Students tested the pH of four different solutions using litmus paper and recorded the observations in the data table         Which solution is neutral? 

• Solution 1
• Solution 2 
• Solution 3 
• Solution 4 

Tags

NGSS.MS-PS1-2

What is one of the characteristics of an acidic compound? 

• pink color 
• slippery feel
• unpleasant odor 
• sour taste 

Predict which of these compounds will react with zinc to produce hydrogen gas. 

• sulfuric acid
• sodium sulfate
• ammonium hydroxide 
• sodium hydroxide 

Tags

NGSS.HS-PS1-1

A solution does not affect red litmus paper but it turns blue litmus paper red. What type of compound was added to water to form the solution? 

• salt
• acid
• base 
• alcohol 

Tags

NGSS.MS-PS1-2

An increased concentration of what ion characterizes a solution of a base in water? 

• hydrogen ion
• hydronium ion 
• hydroxide ion 
• hydrochloride ion 

What products are formed when sulfuric acid, and magnesium hydroxide, react in an acid-base reaction? 

• magnesium sulfate an hydrogen
• magnesium sulfate and water 
• magnesium, sulfur, and water
• magnesium sulfide, water, and oxygen 

Calcium carbonate is sometimes used to treat “heartburn.” What happens when calcium carbonate reaches the stomach? 

• Calcium carbonate absorbs excess stomach acid.
• Calcium carbonate neutralizes acid in the stomach. 
• Calcium carbonate increases the acidity of the stomach. 
• Calcium carbonate causes acid in the stomach to precipitate. 

Tags

NGSS.MS-PS1-2

A student is using a straw to blow bubbles into a calcium hydroxide solution. The carbon dioxide in the student’s breath is reacting with the water to form an acid, which begins to neutralize the basic solution. Which of the following best describes the initial change in pH of the solution? 

• increase in pH toward a pH of 7
• increase in pH away from a pH of 7
• decrease in pH toward a pH of 7 
• decrease in pH away from a pH of 7 

Tags

NGSS.HS-ESS2-5

The table shows the change in pH that occurred when 100.0 mL of an unknown solution were added to 100.0 mL of hydrochloric acid (HCl) solution. Which unknown solution completely neutralized the HCl through a chemical reaction? 

• 1
• 2
• 3
• 4