ium yellow is a pigment commonly us dmium(I) chloride and sodium sulfi the forma
ID: 544506 • Letter: I
Question
ium yellow is a pigment commonly us dmium(I) chloride and sodium sulfi the formation of cadmium yellow ed in paints. It can be produced by the reaction between tde solutions. Write a balanced chemical equation (including states) for 2. Excess iron ions in tap water can cause staining of sinks, tubs, and clothing, as well as impart an unpleasant taste. Naturally occurring iron(II) sulfate is a common source of iron ions in tap water. One way to remove the iron ions is to do a double replacement reaction to form a precipitate containing iron ions as one of the products. Identify a reagent used in lab today that could be reacted with iron(II) sulfate to form an insoluble product, and write the balanced chemical equation (including states) for the reaction.Explanation / Answer
1. Balanced chemical equation:
CdCl2 (aq) + Na2S(aq) -------> CdS(s) + 2NaCl(aq)
When colorless sodium sulfide solution is added to colorless cadmium (II) chloride solution, yellow precipitate of cadmium sulfide is formed. Cadmium yellow is CdS(s)
2.Iron (II) sulfate dissolved in water is one source of iron in tap water.
Sodium carbonate is a source of carbonate ions which will combine with the iron ions to form the insoluble iron(II) carbonate. The balanced chemical equation for reaction is as follows
FeSO4(aq) + Na2CO3(aq) FeCO3(s) + Na2SO4(aq)
This is double-replacement, in which iron and sodium swap places
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