106 239
Assignments Done
97.7%
Successfully Done
In May 2022

# Answer to Question #181093 in General Chemistry for Justin

Question #181093

The groundwater sample was analysed. The measured pH of the test water at 25°C had a value, pH = 3.8. The concentration of Zn2+ ions in water was also determined to be 4.132·10-2 mol/L.

Groundwater is in equilibrium with sediment containing MnO2 and ammonia. Calculate the

concentration of NH4+ ions under these conditions.

Standard reduction electrode potentials for reactions:

Zn 2++ 2e →Zn E°= -0.76V

2MnO 2 + 2NH4+ 2e → Mn2O3 +2NH3+ H2O

E°= 0.74 V

Write a sum cell reaction.

1
2021-04-14T06:10:17-0400

concentration of NH4+ ions = "4.132\u00d7 10^{-2}"Mol/L

"Zn ^{2+}+ 2e \u2192Zn" "E\u00b0= -0.76V"

"2MnO_2 + 2NH_4+ 2e \u2192 Mn_2O_3 +2NH_3+ H_2O"

"E\u00b0= 0.74 V"

Sum cell reaction = "0.74 -0.76 =-0.02V"

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!