Question

QUESTION 1

Which of the following substances is most acidic?

		Cow’s milk - pH 6.6
		Apple juice - pH 3.0
		Tomato juice - pH 4.5
		Distilled water - pH 7.0

2 points   

QUESTION 2

A buffer is a substance that converts:

		Alkaline solutions to neutral solutions.
		Acidic solutions to alkaline solutions.
		Strong bases or acids to weak bases or acids.
		Acidic solutions to neutral solutions. QUESTION 3 How does a solution of pH 7 compare to a solution of pH 10? pH 7 has more OH- ions pH 7 is more basic pH 7 has a higher pH pH 7 has more H+ ions 2 points    QUESTION 4 According to the Arrhenius Theory of acids and bases, a base is: A substance that decrease the amount of hydroxide ions present. A substance that increases the amount of hydroxide ions present when it is dissolved in water. A substance that increase the amount of hydrogen ions present. A substance that increases the amount of hydrogen ions present when it is dissolved in water. QUESTION 5 Which of the following are true regarding acid-base titrations? They are used to determine the concentration of an unknown acid or base. The acid or the base must be a standard solution with a known concentration The standard solution is titrated into the chemical with the unknown concentration. All of the above are true regarding acid-base titrations. 2 points    QUESTION 6 Which of the following is not an example of a neutralization reaction? HCl + NaOH NaCl +H2O 2 NaOH + H2CO3 Na2CO3 +2 H2O H2SO4 + 2 NH4OH (NH4)2SO4 + 2 H2O 2 AgNO3 + Zn 2Ag +Zn(NO3)2 QUESTION 7 Which acid base theory defines an acid as a proton donor and a base as a proton acceptor? Arrhenius Theory Bronsted-Lowery Theory Conjugate Pairs Theory Lewis Theory 2 points    QUESTION 8 The Arrhenius Theory states that acid-base reactions create a solution composed of a water and a salt. This is because mixing an acidic and basic solution together yields: A neutral solution A solution with a pH at or near 7 Both A and B are correct QUESTION 9 Which of the following correctly defines a standard solution? A solution which always has the same molecular geometry. A solution in which the concentration is precisely known. A solution in which the volume is precisely known. A solution which always has different levels of solutes and solvents. 2 points    QUESTION 10 Acids naturally present in food are generally safe to eat because they are usually: Concentrated Dilute Weak Strong None of the above are correct

Answer 1

1) Apple juice

. The lower the pH , the more is the acidity. On the pH scale of 0-14, 0 is the most acidic and 14 is the most basic.

2)Strong bases or acids to weak bases or acids.

A buffer is a solution that can resist pH change upon the addition of an acidic or basic components. It is able to neutralize small amounts of added acid or base, thus maintaining the pH of the solution relatively stable.

3)pH 7 has more H+ ions.

The pH7 solution will be more acidic than the solution of pH 10(as explained in 1). lower pH means more H+ ions because  pH is the negative logarithm of the hydrogen ion concentration (more exactly the activity), or algebraically pH = −log10 [H. +. ]

4) A substance that increases the amount of hydroxide ions present when it is dissolved in water.

An Arrhenius base is a substance that, when dissolved in an aqueous solutiion gives hydroxide, or OH-, ions in the solution.

please ask the questions separately