A small stream adjacent to a chicken farm, polluted with nitrogen, contains the

Question

A small stream adjacent to a chicken farm, polluted with nitrogen, contains the following:
70 mg/L of NO?3, 100 mg/L of NH+4, and 0.5 mg/L of NH3.
2(a) Calculate concentrations of the following chemicals present in the stream in units of
mole/L
i. NO?3
ii. NH+4
iii. NH3
iv. NO?3 + NH+4 + NH3
(b) Calculate concentrations of the following chemicals present in the stream in units of
mg?N
L
:
i. NO?3
ii. NH+
4
iii. NH3
iv. NO?3 + NH+4 + NH3
(c) Calculate concentrations of the following chemicals present in the stream in units of
mole?N
L
:
i. NO?3
ii. NH+4
iii. NH3
iv. NO?3 + NH+4 + NH3

Explanation / Answer

70 mg/L of NO-3, 100 mg/L of NH+4, and 0.5 mg/L of NH3.

a)concentration of NO-3 in mole/L=70*10^-3/62 =1.13 mMole/L

concentration of NH+4 in mole/L=100*10^-3/18 =5.55 mMole/L

concentration of NH3 in mole/L=0.5*10^-3/17 =0.03 mMole/L

concentration of NO-3+NH+4+NH3 in mole/L=1.13+5.55+0.03=6.71 mMole/L

b)

concentration of NO-3 in mg-N/mL=70 mg-N/L

concentration of NH+4 in mg-N/mL=100mg-N/L

concentration of NH3 in mg-N/mL=0.5 mg-N/L

concentration of NO-3+NH+4+NH3 in mg-N/mL=70+100+0.5=170.5 mg-N/L

c)concentration of NO-3 in mole-N/mL=1.13*1=1.13 mMol-N/L

concentration of NH+4 in mole-N/mL=5.55*1 =5.55 mMol-N/L

concentration of NH3 in mole-N/mL=0.03 mMol-N/L

concentration of NO-3+NH+4+NH3 in mole-N/L=1.13+5.55+0.03=6.71 mMol-N/L

Here acidity /basisity of all compounds is 1 .so mol/L = mol-N/L

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