Cell reaction overall is Zn(s)+2H+(aq)→Zn²+(aq)+H2(g).
The half-reaction of oxidation is Zn(s)→Zn²+(aq)+2E- and E°zn2+/zn=0.76v
Half reaction reduction 2H+(aq)+2∈-→H2(g) and E°H+/H2+=0.00v
Cell potential is E°cell=E°cathode-E°anode
=E°H+/H2e-E°zn2+/zn
=0.00v-(-0.76v)
=0.76v
Nernst equation
Ecell = -0.059W/N log [zn²+]PH2/[Zn][H+]²
Ecell = 0.66v
[zn²+]=1.0M
1=[Zn]
PH2=1atm
[H+]=?
n = number of moles of electrons transfered in the cell=2mol
Ecell=E°cell -0.059W/n log [Zn²+]/[Zn][H+]²
0.66v = 0.76 - 0.059W/2 log 1.0×1.0/1.0×[H+]²
0.059W/2 log 1/[H+]² = 0.76v-0.66v = 0.10v
log 1/[H+]² =0.10v×2/0.059W =3.4
-2log [H+] = 3.4
log [H+] = 1.7
[H+] =10-n
=0.020
=2.0×10-²M
The concenrtation in cathodic compartments is 2.0×10-²M
Answer:
Option 1 and 3 are correct.
Explanation:
Buffer solution is the solution which resists the change in the magnitude of the pH when small additions of either acid or base is added. Buffer solutions consist of weak acid and its conjugate base usually which are mixed in relatively equal and large quantities.
Hence,
Option 1. is correct because acetic acid is a weak acid and sodium acetate is the conjugate base of it which are mixed in equal concentrations.
Option 2. is incorrect because HCl and NaCl are both strong acid and salt respectively and will not form a buffer.
Option 3. is correct which is the definition of a buffer solution.
Option 1 and 3 are correct.
Answer:
Sun > Producer > Primary Consumer > Secondary Consumer > Tertiary Consumer > (sometimes Quaternary Consumer >) Decomposer
Explanation:
Answer:
Gravity
Explanation:
Without gravity it would just float in space.
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