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When Substance Z is added to the products of reaction 1 , reaction 2 occurs. substance Z is ?

REACTION 1 

HX ---> H+ + X-

REACTION 2

H+ + Z ---> HZ

A)an acid
B) a buffer
c) an enzyme
D) a sodium ion

i have tried to understand this question and ive read my books but i just dont get it.... if possible can u explain how you figure out the answer so i can understand how to do another question like this in the future. 
Thx
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Acid (chemicals)
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