pH chemistry question- probably a quick one for someone in the know?

Question

The pH of oranges is 3.54. what is the [H+] concentration?

Which has the higest pH- bananas, w/ a pH of 4.9, or orange juice?

Anyone know hwo to do this? It's a science team excersize and I'm not really a chem guy, more so bio. Thanks

Answer 1

if pH = 3.54, [H+] = 10^-3.54 = 2.9 x 10^-4

we do not know the pH of orange juice; however if it is 3.54 and bananas is 4.9, the highest pH is the bananas, the highest concentration of acid is the orange juice. As pH rises, acidity goes down

Answer 2

pH= - log [H+] and it's also known as the acidity of a substance...so a pH of 3.54 would be higher than a pH of 4.9. since the lower the pH value is in actual number the more acidic it is.
4.9 would be the higher pOH value....alkalinity.

the [H+] of the orange juice would be 10^ -pH
= 10 ^ - 3.54
=2.88x10^ -4 mol/L

Answer 3

As Jon said:

pH = - log [H+]

which, when rearranged, equals:
10^[pH] = [H+]

and ya, 4.9 is a higher pH (more basic, less acidic)

BF
4th yr Chem Major
U of O (Canada)

Answer 4

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Answer 5

10^(-3.54) = H+ conc.

4.9 is a higher pH