What is the ph of a 6.4× 10–8 m solution of hcl(aq) at 25 °c? report your answer to the hundredths place?

pH = 6.86

Explanation:

Even though HCl is a strong acid, it is so diluted in water that we have to consider the concentration of H+ ions in water.

Thus, pH will be measured after getting total [H+] (adding up [H+] from HCl and water).

[H+] of HCl is given,  6.4× 10^–8

[H+] of water is measured knowing

[H+][OH-] is found by dissosiation of water

H2O -> H+              and           O-

I          6.4× 10^–8                     0

C         +x                                  +x

E         6.4× 10^–8 + x               x

*concentration of H2O removed because its not needed

Kw = [6.4× 10^–8 + x] [x]

10^-14 = [6.4× 10^–8 + x] [x]

do the quadratics...

x= 7.30×10^-8

total [H+] = 6.4× 10^–8 + x

               = (6.4× 10^–8) + (7.30×10^-8)

               = 1.37 × 10^-7

pH = -log[total H+]

pH = -log[1.37 × 10^-7]

ph = 6.86

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.

it means there are 3 atoms of oxygen