Acids, Bases, and Neutralization Reactions

The table below names five acid-base indicators and shows the colours seen at various pH values. The pH values of some solutions are: Sulphuric acid pH= 1.0 Carbonic acid pH= 5.5 Ammonia pH= 9.0 Sodium hydroxide pH= 12.0 By using the CODE letters of indicators, answer the following question. Which indicators show the same colour in sodium hydroxide?

• A and B

• B and D

• D and E

• B and C

When hydrogen ion concentration is greater than hydroxide ion concentration, the solution is

• basic

• acidic

• neutral

• alkaline

An indicator was used to test a water solution with a pH of 12. Which indicator colour would be observed?

• Colourless phenolphthalein

• Colourless litmus

• Red litmus

• Pink phenolphthalein

Essay Question: You had several opportunities to participate in lab activities to identify acids and bases. What are the different labs you were able to participate in to identify acids, bases, and neutralization reactions?

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NGSS.MS-PS1-5

What is the result of a neutralization reaction?

• Acid and base

• Salt and water

• Only water

• Only salt

What is the product of a neutralization reaction between an acid and a base?

• Salt and water

• Acid and base

• Water and carbon dioxide

• Salt and hydrogen gas

What is the general word equation for a neutralisation reaction?

• Acid + Metal → Salt + Hydrogen

• Acid + Base → Salt + Water

• Metal + Oxygen → Metal Oxide

• Acid + Carbonate → Salt + Water + Carbon Dioxide

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NGSS.MS-PS1-5

What is Bromthymol Blue, and how is it used to identify an acid or a base?

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When the following ions are present in a solution, what type of substance is indicated?

• base

• more OH-

• neutral

• equal H+ and OH-

• acid

• more H+