1.Which of the following is most soluble in water and why ?
a.Ag2SO4 b.Hg2SO4 c.MnCO3 d.CaSO4
2.PH of which salt is same for 1M and 5M solution both and why?
a.HCOONa b.C6H5NH3^+Cl c.NH4CN d. NaCN
3.NH4OH is highly soluble in and why ?
a.CuSO4 b.AgNO3 c.NH4Cl d.Both 1&2
1. To determine which compound is most soluble in water, we need to look at their solubility rules.
a. Ag2SO4: This compound is not very soluble in water and is considered slightly soluble.
b. Hg2SO4: This compound is also not very soluble in water and is considered slightly soluble.
c. MnCO3: This compound is insoluble in water and will not dissolve.
d. CaSO4: This compound is slightly soluble in water, but more soluble than Ag2SO4 and Hg2SO4.
So, among the given options, CaSO4 is the most soluble in water.
2. To determine which salt has the same pH for both 1M and 5M solutions, we need to consider the nature of the salt and its ionization in water.
a. HCOONa: This salt dissociates into formate ions (HCOO-) and sodium ions (Na+). The concentration of these ions increases with increasing concentration of the solution, which affects the pH. Therefore, the pH will differ between the 1M and 5M solutions.
b. C6H5NH3+Cl: This salt is an ammonium salt and is acidic. The pH will change with increasing concentration due to the increased concentration of acidic ions.
c. NH4CN: This salt is also an ammonium salt and is acidic. The pH will change with increasing concentration due to the increased concentration of acidic ions.
d. NaCN: This salt is the only option that contains a strong base (NaOH) and a weak acid (HCN). In this case, the pH remains the same for different concentrations because the strong base completely neutralizes the weak acid.
Therefore, the salt NaCN has the same pH for both 1M and 5M solutions.
3. NH4OH is highly soluble in water due to its nature as a strong base.
a. CuSO4: This compound does not significantly affect the solubility of NH4OH.
b. AgNO3: This compound also does not significantly affect the solubility of NH4OH.
c. NH4Cl: This compound has a similar nature to NH4OH and can increase the solubility of NH4OH when dissolved together.
d. Both 1&2: Since neither CuSO4 nor AgNO3 significantly affect the solubility of NH4OH, only NH4Cl contributes to its high solubility.
Therefore, NH4OH is highly soluble in the presence of NH4Cl.