If a solution has a pH of 5.4, what is the [H3O+] concentration? a) 4.0 x 10^-6

Question

If a solution has a pH of 5.4, what is the [H3O+] concentration? a) 4.0 x 10^-6 b) 4.3 x 10^-2 c) 2.5 x 10^5 d) 1.6 x 10^-7 e) 0.0015

Which of the following is true of a buffer solution? a) it resists change in pH b) It is composed of a weak acid and the salt of its conjugate base c) Your blood is considered a buffered solution d) Sodium bicarbonate, proteins, and Sodium phosphate are the main buffers in your blood e) All of the above are true

If the [H3O+] of a sewer water sample is 4.7 x 10^-4 M, the pH of the sample is ______, and the sample is _____      a) 3.3; basic   b) -3.3: acidic c) 3.3; acidic d) 10.6 basic   e) -10.6 basic

Explanation / Answer

1. [pH=5.4 -log [H+] =5.4, [H+] =10-5.4 =3.98*10-6 ( A is the correct answer)

2/ It resits change in pH (A is correct ) and B is also correct. Rest of them are incorrect

3. [H3O+] =4.7*10-4 pH=-log (4.7*10-4)=3.33

3.33 is acidic (C is the correct answer)

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