Which compound is a conjugate acid-base pair?

H2PO4 - and HPO42-

H3PO4 and HPO42-

H2PO4 - and PO43-

H3PO4 and PO43-

What are the standard ways to make a solution of known concentration? (select all that apply.) ?

How many molecules are in 3.2 mol of ammonia, NH3

If a seed crystal was added to a supersaturated solution, how would you characterize the resulting solution?

How efficient are electric engines

How is the modern atomic model different from Bohr's model

Which of the following is the best description of covalent bonding? 1. Bonding that occurs between elements with similar electronegativities, and with transfer of electrons. 2.

You are asked to smell a solution in a beaker. what is the best way of doing this?

The specific gravity of iron is 7.87, and the density of water at 4.00 ∘C is 1.00 g/cm3. You can use this information to find the density of iron. Find the volume occupied by 4.50 g of iron.

The volume of a gas is 93 ml when the temperature is 91? c. if the temperature is reduced to 0? c without changing the pressure, what is the new volume of the gas?

15.434 g of kcl (m. m 74.55 g/mol) is dissolved in water up t a total volume of 500.0 mL. the density of this solution is 1.02 g/mL. what is the concentration of he solution in molality