Ans :
Balanced reaction is given as :
HCl + NH3 = NH4Cl
so using the formula : M1V1 = M2V2
M1 = 0.800 M
V1 = 17.9 mL
V2 = 5.00 mL
putting values :
0.800 M x 17.9 mL = M2 x 5.00 mL
M2 = 2.86 M
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