If an acid is added to the water, the pH will?
a) remain the same
b)go down
c) go up
Answer:
b) go down
b) go down.
b
-wow thats not a basic question at all...hehe
it would go down
pH goes down i mean to say it neutralises.
GO DOWN
It will certainly go up. See water acids can have PH<7. Strong acids have lesser PH values. Eg conc.H2SO4 or conc.HCl will have PH valve 1. When water is added, as water is neutral(PH-7), PH of water will increase will increase. If it had been a base, it will have PH>7 so PH would had go down.
So answer is go up.
Generally, people would say since, the solution of acid becomes dilute, the pH will get slightly lowered. But, it is more than this.
It depends on the strength and concentration of acid. Refer this site:
http://www.wiley.com/legacy/college/boye...
pH goes down but doesn't neutralise because water is not alkaline. The overall solution becomes acidic having a pH less than 7 because acid will have pH less than 7 and water will have pH=7.
pH = -log[H3O+]
Hence pH is solely dependent on the concentration of H3O+ ions in solution.
However, concentration depends on the the volume of the solution and moles of H3O+ in solution.
If we add an acid to water, the moles of H3O+ definately increase (water ionises slightly), but volume also increases as you are increasing the volume of the overall solution.
So there are 2 situations.
- Adding a dilute acid with a large volume to water will cause little change to the pH.
- Adding a concentrated acid with a small volume to water will cause a large decrease in pH.
It is entirely situational, unless there are numbers to crunch there cannot be one definate answer.
If we take n = cv, c= n/v
Simple really.
Remember that pure water has a pH of 7.
Now note that all acids have a pH lower than 7 and alkalis have a pH higher than 7.
7 is the neutral point in the middle
From this it is clear that water + acid must have a pH lower than 7 since in effect you are taking something with a low pH and "watering it down" with neutral water.
Conversely, if you take an alkali (pH higher than 7) than adding it to water, or water to it is watering it down , thus moving it towards the neutral point of 7 but still remaining above 7.
See how it works? (hope you do)
goes down
The pH of the solution will certainly be less than that of pure water(pH = 7). On addition of an acid to pure water, the hydrogen ion concentration in water increases and the pH decreases.
Go down. Less than 7 depending upon the concentration of Acid added.
It will go down. The pH of acid shud be<7 & for a base shud be>7 & 7-neutral
The pH will go down Below 7 and will gradually go down according to the concentration of the acid added to the water.
it depends on the concentration of acid and the amount of water
its (b) cauz wen we add acid to water the concentration changes from seven to one which varies as which acid u r taking
b) go down
a) remain the same
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b)go down
c) go up
Answer:
b) go down
b) go down.
b
-wow thats not a basic question at all...hehe
it would go down
pH goes down i mean to say it neutralises.
GO DOWN
It will certainly go up. See water acids can have PH<7. Strong acids have lesser PH values. Eg conc.H2SO4 or conc.HCl will have PH valve 1. When water is added, as water is neutral(PH-7), PH of water will increase will increase. If it had been a base, it will have PH>7 so PH would had go down.
So answer is go up.
Generally, people would say since, the solution of acid becomes dilute, the pH will get slightly lowered. But, it is more than this.
It depends on the strength and concentration of acid. Refer this site:
http://www.wiley.com/legacy/college/boye...
pH goes down but doesn't neutralise because water is not alkaline. The overall solution becomes acidic having a pH less than 7 because acid will have pH less than 7 and water will have pH=7.
pH = -log[H3O+]
Hence pH is solely dependent on the concentration of H3O+ ions in solution.
However, concentration depends on the the volume of the solution and moles of H3O+ in solution.
If we add an acid to water, the moles of H3O+ definately increase (water ionises slightly), but volume also increases as you are increasing the volume of the overall solution.
So there are 2 situations.
- Adding a dilute acid with a large volume to water will cause little change to the pH.
- Adding a concentrated acid with a small volume to water will cause a large decrease in pH.
It is entirely situational, unless there are numbers to crunch there cannot be one definate answer.
If we take n = cv, c= n/v
Simple really.
Remember that pure water has a pH of 7.
Now note that all acids have a pH lower than 7 and alkalis have a pH higher than 7.
7 is the neutral point in the middle
From this it is clear that water + acid must have a pH lower than 7 since in effect you are taking something with a low pH and "watering it down" with neutral water.
Conversely, if you take an alkali (pH higher than 7) than adding it to water, or water to it is watering it down , thus moving it towards the neutral point of 7 but still remaining above 7.
See how it works? (hope you do)
goes down
The pH of the solution will certainly be less than that of pure water(pH = 7). On addition of an acid to pure water, the hydrogen ion concentration in water increases and the pH decreases.
Go down. Less than 7 depending upon the concentration of Acid added.
It will go down. The pH of acid shud be<7 & for a base shud be>7 & 7-neutral
The pH will go down Below 7 and will gradually go down according to the concentration of the acid added to the water.
it depends on the concentration of acid and the amount of water
its (b) cauz wen we add acid to water the concentration changes from seven to one which varies as which acid u r taking
b) go down
a) remain the same
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