Identifying Acids and Bases

Which of the following formulas below are acids? ( Select ALL that apply)

• H₂SO₄

• HCl

• NaOH

• CaCO₃

Carrie's teacher hands out test tubes filled with different chemicals and tells the students to identify their liquid as an acid, base, or neutral chemical. Carrie's test tube contains a clear chemical. She adds phenolpthalein to her test tube and gently moves the tube from side to side. A few moments later, the chemical in the test tube turns bright pink.
What type of chemical does Carrie have?

• Carrie has a neutral chemical.
• Carrie has an acidic chemical.
• Carrie has a basic chemical.
• The type of chemical Carrie has cannot be determined.

Tags

NGSS.MS-PS1-2

Which of the following word pairs correctly completes the sentence below?

_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.

• Acids; pH less than 7

• Acids; pH greater than 7

• Bases; pH greater than 7

• Bases; pH less than 7

If an acid is combined with a base of equal strength, the result will most likely be

• strong base

• a stronger acid.

• impossible to tell without testing the pH.

• a neutral solution.

Tags

NGSS.MS-PS1-2

When bases are added to water, what kind of ions are produced?

• H⁺

• OH^-

• A^-

• B⁺

Tags

NGSS.MS-PS1-2

Many cleaning solutions are bases. Which of the following is a property of most bases?

• feels slippery
• white color
• can only be liquid
• tastes sour

 Which of the following is an acid?

• shampoo
• baking soda
• orange juice
• water

Tags

NGSS.HS-PS1-1

Of the following which is NOT a pH indicator?

• Phenol Red

• Cabbage Juice

• Phenolphtalein

• Phenol Purple

The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?

• 3
• 9
• 7
• 5

Pure water has a pH of 7. Pure water _______.

• is a base
• is a neutral substance
• could be either an acid or a base
• is an acid