EASY MEDAL

5. What is the approximate hydronium ion concentration and hydroxide ion concentration in a cup of tea? Which is higher? (Refer back to the chart of pH if you need to.)

Question

EASY MEDAL 

5.	What is the approximate hydronium ion concentration and hydroxide ion concentration in a cup of tea? Which is higher? (Refer back to the chart of pH if you need to.)

abhisar · Answer

@WhisperZ kindly put it in chemistry section. They will be able to help u out better !

anonymous · Answer

If 6.31 x 10^-7 mol dm-3 is a correct figure the pH is indeed 6.2. 
 This is an an acidic value (any pH less than 7) so [H3O^+] must be greater than [OH^-] 

 Alternatively since at 25C [H^+][OH^-] = 10^-14 

 [6.31 x 10^-7][OH^-] = 10^-14, 

 [OH^-] = 1.58 x 10^-8 which is less than [H^+] 

BTW this question shouldn't be in this section