Acid Base Titrations

Using the volume of EDTA required to reach the end point and the molarity of EDTA, the concentration of Ca and Mg ions in the sample is calculated to be 0.0005 M.

The mass of the solution is: The mass percent of H2SO4 is given by: So, the correct answer is (b) 33\%.

Given that for NH3 is , we can calculate its corresponding for NH4+ using the relationship , where . This equation connects the acid dissociation constant ( ) and the base dissociation constant ( ) for conjugate acid-base pairs.

Using the given values, we can calculate for NH4+ as follows:

This value corresponds to the acid dissociation constant for NH4+, and this is useful in understanding the concentration in a solution of NH4+.

Therefore, the correct answer is (a) NH3.

The solubility product, , is the product of the concentrations of the ions in their dissolved state, each raised to the power of its respective coefficient in the dissociation equation. For copper(II) hydroxide, Cu(OH) , the dissociation is given by: Thus, the expression for the solubility product is: Hence, the correct answer is (a).

The conjugate base of an acid is what remains after the acid donates a proton. In this case, (carbonic acid) donates a proton to become , which is the conjugate base. Thus, the correct answer is (b).