What ions, if any, do each of the following substances produce in aqueous soluti
ID: 705302 • Letter: W
Question
What ions, if any, do each of the following substances produce in aqueous solution? Calcium nitrate, Ca(NO3)2 Ammonium phosphate , (NH4)3PO Methane, CH4 Copper (I) sulfate, Cu2SO Circle each of the following substances that will possess electrical conductivity. i) Hexane, C6H14, liquid ii) sulfur nonmetal , S ???) formic acid, HCOOH, dissolved in water Lactose dissolved in water v) Copper (II) sulfate, CuSO4, dissolved in water vi) Potassium sulfate, K2S04, dissolved in methanol 6-10 EM1814-YEAR-2017-2018Explanation / Answer
Answer: A
Water is a polar solvent so most of the polar (mainly the electrolytic compounds i.e. compounds of group 1 and 2 elements ) dissolve and gets dissociated in the elemental ions.
(i) Ca(NO3)2 will dissociate in aqueous solution to give Ca2+ and NO3- ions.
(ii) Ammonium Phosphate, (NH4)3PO4 will dissociate in aqueous solution to give NH4+ and PO4- ions.
(iii) As methane (CH4) is an organic compound so it will not dissolve in aqueous solution. So it will not give any ions.
(iv) Copper (I) Sulfate, Cu2SO4 dissociates in water but not as ions, it dissociates in elemental copper (Cu) and Copper (II) Sulfate, CuSO4
Answer: B
All the solutions or compounds which have free ions in them will conduct electricity because those ions will act as charge carrier and will maintain the flow of current
(i), (ii) and (iv) will not conduct any electricity as they have not any free ions.
(iii) can conduct very little electricity because HCOOH is sparingly soluble in water. It dissociates as H+ and COO- but very less fraction.
(v) and (vi) can conduct electricity very well because of the presence of large no. of free ions (for example, K2SO4 will dissociate as K+ and SO42- )
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