Are These Chemical Reactions Correctly Balanced?

[prabhjyot]

please check my work... urgent pleasezz

1> ZnCl2 [aq] + 2KNO3 [aq] → Zn(NO3)2[aq] + 2KCl (s)

2> Ca[OH]2 [aq] + 2Na OAc [aq] →Ca(OAc)2[aq] + 2NaOH (s)

3> NiCl2 + 2KOH → Ni(OH)2 [aq]+ 2KCl (s)

 

[chemisttree]

1> ZnCl2 [aq] + 2KNO3 [aq] → Zn(NO3)2[aq] + 2KCl (s)

2> Ca[OH]2 [aq] + 2Na OAc [aq] →Ca(OAc)2[aq] + 2NaOH (s)

3> NiCl2 + 2KOH → Ni(OH)2 [aq]+ 2KCl (s)

I don't know what you are asking here but I'll guess that you want to know something about the letters in brackets... (s) or (aq)? Look at the solubility products for the reactants and products to determine if something will precipitate or remain soluble. For example, 2) shows an aqueous solution of calcium hydroxide (which is not very soluble at 0.16 g / 100 mL) producing some sodium hydroxide. This small amount of sodium hydroxide will undoubtedly remain soluble and so the brackets that show NaOH (s) is incorrect here. The other product Ca(OAc)2 is soluble to a degree of 40 g per 100 mL of water at 0C... much higher than the solubility of Calcium hydroxide.