Acids & Bases in Food Science

Which of the following is not a characteristic of a base?

• Bitter taste

• Slippery to the touch

• Change blue litmus paper to red

• Change red litmus paper to blue

• Have a pH greater than seven

An unknown substance was tested using red litmus paper and the paper turned blue, which of the following is a probable pH for the substance?

• 1

• 3

• 5

• 7

• 9

In the reaction between hydrochloric acid and sodium hydroxide, which common substance is formed as the salt of the acid-base reaction?

• Table salt

• Season salt

• Low sodium salt

• Low chlorine salt

• None of the above

In the reaction between hydrochloric acid and sodium hydroxide, which common substance is formed as the salt of the acid-base reaction?

• NaCO

• NaOH

• NaH

• NaHCO₃

• NaCl

The range of the pH scale is which of the following?

• One to ten

• One to twelve

• Zero to ten

• Zero to twelve

• Zero to fourteen

If you wanted to know the exact pH of a substance, which of the following indicators would you use?

• pH paper

• Digital pH meter

• Red litmus paper

• Blue litmus paper

• Both A and B

Which of the following is the most exact in its measure of pH?

• pH paper

• Red cabbage juice

• Blue litmus paper

• Digital pH meter

• Red litmus paper

Which of the following factors affect food deterioration and spoilage?

• Acidity

• Heat

• Water activity

• Chemical preservatives

• All of the above

Which of the following substances is likely to have a pH less than 7?

• Vinegar

• Bleach

• Soap

• Baking soda

• Ammonia

What is the color change observed when blue litmus paper is dipped in an acidic solution?

• Blue to green

• Blue to red

• Blue to purple

• Blue to yellow

• No change