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3 years ago

Which of the following accurately describes the pH scale?

Chemistry

2 answers:

aleksandrvk [35]3 years ago

6 0

The correct answer is <span>B. The greater the pH is, the lower the acidity is.</span>

seraphim [82]3 years ago

5 0

Answer is: B. The greater the pH is, the lower the acidity is.

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.

When pH is less than seven (pH<7), solution is acidic.

When is equal seven (pH = 7), solution is neutral.

When pH is greater than seven (pH > 7), solution is basic.

An acid is a molecule or ion capable of donating proton or hydrogen ion H⁺.

For example, hydrochloric acid( HCl) is acidic, it ionizes in water solution and gives the hydrogen cations and chloride anions (Cl⁻):

HCl(aq) → Cl⁻(aq) + H⁺(aq).

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Answer:

Explanation:

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3 years ago

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4 years ago

What happens to a magnetic field if the current carrying wire A has three times as many loops but the same current as the curren

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3 years ago

Read 2 more answers

Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in

igor_vitrenko [27]

Explanation:

Oxidizing agents are defined as the agents which oxidize other substance and itself gets reduced. These agents undergoes reduction reactions.

Reducing agents are defined as the agents which reduces the other substance and itself gets oxidized. These agents undergoes reduction reactions.

When oxidizing agent-A get reduced it changes green to colorless.

$A+e^-\rightarrow A^-$

When oxidizing agent-B get reduced it changes yellow to colorless.

$B+e^-\rightarrow B^-$

When oxidizing agent-C get reduced it changes red to colorless.

$C+e^-\rightarrow C^-$

1) When we added solution C that oxidizing agent-C in solution containing $B^-$ ions changes from red to yellow:

$C+B^-\rightarrow C^-+B(yellow)$

So, in this C is oxidizing $B^-$ ion into B which yellow in color.

C is reduced and $B^-$ ions is oxidized.

Here, $B^-$ are oxidized by C which means that C a better oxidizing agent than B.

2) When a solution of C is mixed with one containing A- ions, the color remains red.

$C+A^-\rightarrow$ no reaction

As we had observed that no color change was seen on adding substance C to the solution with $A^-$ ions which indicates that C was unable to oxidize $A^-$ ions. Hence, not a better oxidizing agent than A

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3 years ago

How can you experimentally determine the pK_a of acetic acid? Determine the pH of the solution 1/4 of the way to the end-point o

Vlad1618 [11]

Answer:

Determine the pH of the solution half-way to the end-point on the pH titration curve for acetic acid.

Explanation:

The equation for the ionization of acetic acid is

HA + H₂O ⇌ H₃O⁺ + A⁻

For points between the starting and equivalence points, the pH is given by the Henderson-Hasselbalch equation:

$\text{pH} = \text{pK}_{\text{a}} + \log\dfrac{[\text{A}^{-}]}{\text{[HA]}}$

At the half-way point, half of the HA has been converted to A⁻, so [HA] = [A⁻]. Then,

$\text{pH} = \text{pK}_{\text{a}} + \log\dfrac{1}{1} = \text{pK}_{\text{a}} + 0 \\\\\text{pH} = \text{pK}_{\text{a}}$

The pKₐ is the pH at the half-way point in the titration.

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3 years ago