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Anika [276]
3 years ago
13

A student uses an indicator to measure the pH of a solution. The indicator shows a pH of 7. What must be true of this solution?

Physics
2 answers:
Nonamiya [84]3 years ago
8 0
A pH of 7 is known as "natural"

 A pH below 7 is an acid

A pH above 7 is a base

Acids give up hydrogen ions, shown as H+ 
Bases accept  H+, hydrogen ions.

Equilibrium is when a chemical reaction doesn't favor the reactants or products and can go in reverse. 
pH of 7 are related to Equilibrium.

With the info I have given you, it's obviously not one of the last 2 you listed.

pH measures the alkalinity and acidity of a solution by the Hydrogen ions, H+. Therefore, the solution has to have Hydrogen ions to react/be measured by the pH paper.

Therefore, your answer is the 2nd statement. 
The solution has equal amounts of hydronium ions and hydroxide ions. 
zloy xaker [14]3 years ago
4 0

Answer:

The solution has equal amounts of hydronium ions and hydroxide ions.

Explanation:

From the very beginning it is clear that answer choices 3 and 4 are incorrect, as a pH of 7 means it is neutral.

The pH of anything being 7 (neutral) means it is neither an acid (1-6) nor a base (8-14).

This essentially levels things out meaning that there will be an equal amount.

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(a) 1200 rad/s

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\omega_f = \omega_i + \alpha t = 2000 rad/s + (-80.0 rad/s^2)(10.0 s)=1200 rad/s

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We can calculate the time needed for the rotor to come to rest, by using again the same formula:

\alpha = \frac{\omega_f - \omega_i}{t}

If we re-arrange it for t, we get:

t = \frac{\omega_f - \omega_i}{\alpha}

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\omega_i = 2000 rad/s is the initial angular speed

\omega_f=0 is the final angular speed

\alpha = -80.0 rad/s^2 is the angular acceleration

Solving the equation,

t=\frac{0-2000 rad/s}{-80.0 rad/s^2}=25 s

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