Problem- what is the concentration of nh4 in a 020 m, Chemistry

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Problem- what is the concentration of nh4 in a 020 m

Problem- What is the concentration of NH4+ in a 0.20 M ammonia solution? The base dissociation constant for ammonia is 1.8 x 10^-5.

a) 0.0019 M

b) 0.20 M

c) 0.040 M

d) 0.020 M

Please illustrate how you got the answer mainly the part of how you got the pH

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