How many H+ ions in 0.050 ml

  • Thread starter ducmod
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  • #1
ducmod
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Hello!
Here is a problem that looked easy for me, but my answer differs from the textbook's one. Please, help me to see my mistake.

How many H3O ions are present in one

drop (0.050 mL) of pure water at 25 °C?

Here is how I solved it:
There are 1.0 x 10^-7 in one liter.
We have 0.000050 liters, hence 0.00005 x 1.0 x 10^-7 = 5 x 10^-12

The book gives 3 x 10^12

Thank you!
 

Answers and Replies

  • #2
Borek
Mentor
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3,659
You do understand the difference between number of moles and number of ions?
 
  • #3
ducmod
86
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You do understand the difference between number of moles and number of ions?
Oh! What a shame ) Sorry. Yes. I have to multiply my moles 5 x 10^-12 by 6.022 x 10^23
Thank you!
 

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