4. Identify the conjugate acid – base pairs in the following equations; H2PO4- + OH- HPO42- + H2O

The correct options is, H2O and H3O+

Explanation:

According to the Bronsted Lowry conjugate acid-base pair concept, an acid is a substance which donates protons and a base is a substance which accepts protons.

From the given options,  and  represents a base-conjugate acid pair.

The balanced reaction will be :H2O +H+ = H3O+

In this, H2O   is a base which accepts a proton to form conjugate acid .

Hence, the correct options is,H2O and H3O+

to make a supersaturated solution, make a saturated solution of sugar by adding 360 grams of sugar to 100 ml of water at 80 degrees celsius. when the water cools back down to 25 degrees, that 360 grams of sugar will still be dissolved even though the water should only dissolve 210 grams of sugar.