A neutral sample of water is? Which is a weak acid?

Question

A neutral sample of water is

A. [H3O+]=[OH-]

B. [H3O+]=1 X 10^-7 M

C. PH=7

D. ALL THE ABOVE

2. WHICH IS A WEAK ACID?

A. HCL

B. HNO3

C. H3PO4

D. H2SO4

Answer 1

D

C

Answer 2

Both C

Answer 3

1. D  water has an ionizatio constant of 1 X 10 ^-14 so the [H+] = 10^-7M, [OH-1] = 10^-7M, \

pH = -log [H+] = -log 10^-7 = 7

2.  C   HCl , HNO3 and H2SO4 are strong acids in that they are 100% ionized  yelding an ionization constant approaching

infinity.  Phosphoric acid ( H3PO4) has a first ionization constant of 7.5 X 10^-1is is therefore not totally ionized and is a weak acid

Answer 4

1. C

2. B

For question number 2 , i am not sure.

Answer 5

1-ph=y

2-im not quite sure, but hcl (hydrochloric acid) is very strong, but so is sulfuric acid (h2so4) i'm sure you will get answers for numbe 2