4. circle all the pairs of compounds below that represent a conjugate acid base pair.

a. h2s/hs-
b. h3po4/kh2po4
c. ca(oh)2/caso4
d. ch3co2h/nach3co2

The correct answer is a H2S/HS-  

Explanation:

H2S/HS- is a conjugate acid base pair because H2S is the conjugate acid as it has the ability to donate proton and according to the Arrhenius law we all know that that substance that can donate proton is called acid.Whereas HS- is the conjugate base .

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).