What is the conjugate base for H2S (hydrogen sulfide) expressed as a chemical formula?

Question

aaronq · Answer

write the formula for it acting as an acid, meaning losing a proton.

anonymous · Answer

HS would be correct?

anonymous · Answer

Can you give me an example?

aaronq · Answer

hm close you need a negative charge on the sulfur

aaronq · Answer

$HA  \rightleftharpoons H^++A^-$

anonymous · Answer

Okay, so it'll be HS-.

But, its asking to express it as a chemical formula. So, how would I find the base and conjugate to complete the formula?

aaronq · Answer

hm that is the conjugate base.

For example. if $H_2S$ reacts with water

 $\underbrace{H_2S}_{acid}+\underbrace{H_2O}_{base}\rightleftharpoons \underbrace{HS^-}_{conjugate~base}+\underbrace{H_3O^+}_{conjugate ~acid}$

anonymous · Answer

Oh, Okay. So basically when it ask for the conjugate base of an element for the base just assume that it is water?

aaronq · Answer

not necessarily, with some species water acts as the acid.

The conjugate base is what the species is after it's lost a proton. 

Here's it's reaction with ammonia    $ H_2S +NH_3\rightleftharpoons HS^-+NH_4^+$

anonymous · Answer

Ok.