8.6D - Acids-Bases

A scientist is conducting a pH test on a solution. As she dips red litmus paper in the solution it turns blue. Which conclusion can be made about the fluid?

• A. The litmus paper needs to be replaced due to an inaccurate test result.

• B. The fluid is a neutral solution.

• C. The fluid is a base.

• D. The fluid is an acid.

Which of the following descriptions are properties of an acid? Select TWO correct answers.

• Soapy texture

• Corrosive

• Sour taste

• Hydrogen acceptor

• pH of greater than seven

When compared to water, which of the following statements is TRUE about bases?

• Bases have a higher pH than water.

• Bases are less corrosive than water.

• Bases have a lower pH than water.

• Bases are less conductive than water.

A scientist is conducting a laboratory experiment to identify whether a substance is an acid or a base. Data from the experiment is listed in the table. Which of the following is the BEST conclusion based on the data?

• Both substances are bases because they are both corrosive.

• Substance A is an acid because it has a low pH and reacts with bases.

• Both substances are acids because they are both conductive.

• Substance B is an acid because it has a high pH and reacts with other acids.

Tags

NGSS.MS-PS1-2

Students conducted tests on a solution to determine if it was an acid or a base. They found the solution both conducted electricity and was corrosive. What other data would most likely help them determine if the solution is an acid or a base?

• Measure its freezing point

• Determine its transparency

• Measure its density

• Determine its pH

Students created a table to compare properties of some substances. Which terms would be the BEST titles for the columns?

• A. X: Acids, Y: Bases

• B. X: Conductors, Y: Insulators

• C. X: Indicators, Y: Neutrals

• D. X: Bases, Y: Acids

Tags

NGSS.MS-PS1-2

Water has a neutral pH. This means that it has an equal amount of hydrogen and hydroxide ions. Which statement BEST describes how acids and bases compare in the amount of hydrogen and hydroxide ions?

• Bases tend to produce more hydrogen ions and acids produce more hydroxide ions when dissolved in water.

• Acids tend to produce more hydrogen ions and bases produce more hydroxide ions when dissolved in water.

• Acids produce more hydrogen ions than water but less than bases within an aqueous solution.

• Bases produce more hydrogen ions than water but less than acids within an aqueous solution.

When a scientist conducts a pH test, the blue litmus paper remains blue. Which of the following statements is TRUE?

• The substance is neutral because blue litmus paper remains unchanged in the presence of a neutral solution.

• The substance is a base because blue litmus paper remains unchanged in the presence of a base.

• The substance is an acid because blue litmus paper remains unchanged in the presence of an acid.

• The substance is either neutral or a base because blue litmus paper remains unchanged in the presence of a neutral or basic solution.

In a laboratory, a student is conducting tests on an acidic substance. Which of the following results would NOT be expected?

• The pH would be less than seven.

• The substance would be corrosive.

• The substance would react with acids.

• The substance would be conductive.

Is this substance acidic, basic, or neutral?

• Acidic
• Basic
• Neutral

Tags

NGSS.MS-PS1-2