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Topic: How many times more acidic is cider than..  (Read 5785 times)

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Offline MysteriousEd

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How many times more acidic is cider than..
« on: November 11, 2013, 05:12:10 PM »
Cider has a pH of about 3 and black coffee has a pH of about 5. How many times more acidic is cider than coffee?

Is it 100 times, 2 times, or 20 times?

I don't get this question
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Offline Archer

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Re: How many times more acidic is cider than..
« Reply #1 on: November 11, 2013, 05:14:19 PM »
What is pH and how is it calculated?
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Offline MysteriousEd

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Re: How many times more acidic is cider than..
« Reply #2 on: November 11, 2013, 05:15:34 PM »
Quote from: Archer on November 11, 2013, 05:14:19 PM
What is pH and how is it calculated?

Using logarithmic scale.  The cider has a pH of 3 and coffee 5.
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Offline Archer

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Re: How many times more acidic is cider than..
« Reply #3 on: November 11, 2013, 05:19:29 PM »
What is the concentration of H+ in a solution at pH = 3?
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Offline MysteriousEd

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Re: How many times more acidic is cider than..
« Reply #4 on: November 11, 2013, 05:36:24 PM »
10^-3?
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Online Borek

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Re: How many times more acidic is cider than..
« Reply #5 on: November 11, 2013, 05:37:46 PM »
And at pH 5?
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Offline MysteriousEd

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Re: How many times more acidic is cider than..
« Reply #6 on: November 11, 2013, 05:43:06 PM »
10^-5
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Online Borek

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Re: How many times more acidic is cider than..
« Reply #7 on: November 11, 2013, 06:06:20 PM »
And what is ratio of 10-3/10-5?
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Offline MysteriousEd

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Re: How many times more acidic is cider than..
« Reply #8 on: November 11, 2013, 06:12:23 PM »
Aw, I don't even know how to find the ratio.. hah. Was i supposed to divide?
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Offline MysteriousEd

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Re: How many times more acidic is cider than..
« Reply #9 on: November 11, 2013, 09:14:03 PM »
So is it 2 times? maybe?^^
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Offline Archer

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Re: How many times more acidic is cider than..
« Reply #10 on: November 12, 2013, 01:03:44 AM »
Quote from: MysteriousEd on November 11, 2013, 09:14:03 PM
So is it 2 times? maybe?^^

Please don't answer a question with the word maybe as it looks like you have guessed the answer. Show your calculation and we can see whether or not you have got it right.

If I had 1x104 apples and 1x102 pears how many times more apples do I have? Twice as many?
« Last Edit: November 12, 2013, 02:47:31 AM by Archer »
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Online Borek

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Re: How many times more acidic is cider than..
« Reply #11 on: November 12, 2013, 02:43:39 AM »
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Offline AlphaScent

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Re: How many times more acidic is cider than..
« Reply #12 on: November 12, 2013, 09:57:58 AM »
Look up and read logarithmic scale, pH and ratio.  Then attempt the question.

http://en.wikipedia.org/wiki/Log_scale
http://en.wikipedia.org/wiki/PH

Borek gave you ratio. 

Contrary to popular belief, information is not learned through osmosis.
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Offline Archer

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Re: How many times more acidic is cider than..
« Reply #13 on: November 12, 2013, 11:06:22 AM »
Quote from: AlphaScent on November 12, 2013, 09:57:58 AM

Contrary to popular belief, information is not learned through osmosis.


I have many books on my shelf which I was hoping to absorb information from this way as I don't have time to read them at present :)
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“ I love him. He's hops. He's barley. He's protein. He's a meal. ”

Denis Leary.

Offline MysteriousEd

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Re: How many times more acidic is cider than..
« Reply #14 on: November 12, 2013, 11:48:20 AM »
The answer is 100 times. I learned about it. Thanks all ^^
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