Question

Iron and calcium ions are known to chelate with EDTA. Suppose the water used in preparation of your zinc chloride solution in the volumetric flask contained some levels of PB2+ or Ca2+ metal. How will this effect the following?

a) The number of moles of EDTA calculated.

b) The number of moles of zinc calculated

c)The number of moles of chloride ion calculated

d) The empirical formula or the ratio of zinc to chloride obtained?

Answer 1

The presence of PB2+ or Ca2+ metal ions in the water used to prepare a zinc chloride solution can affect the calculations related to the number of moles of EDTA, zinc, chloride ions, and the empirical formula.

Step-by-step explanation:

When water containing PB2+ or Ca2+ metal is used in the preparation of a zinc chloride solution, it can affect the calculations related to the number of moles of EDTA, zinc, chloride ions, and the empirical formula or ratio of zinc to chloride.

a) The presence of PB2+ or Ca2+ metal ions can interfere with the chelation of EDTA with zinc ions, resulting in an underestimation of the number of moles of EDTA calculated.

b) The number of moles of zinc will not be affected by the presence of PB2+ or Ca2+ metal ions in the water.

c) The number of moles of chloride ions will not be affected by the presence of PB2+ or Ca2+ metal ions in the water.

d) The empirical formula or ratio of zinc to chloride obtained will not be affected by the presence of PB2+ or Ca2+ metal ions in the water.