scan0005 - Q 4.18 Report your observations and results for...

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Unformatted text preview: Q 4.18 Report your observations and results for the experiments with 1 M N H and with the solution 111 which [NH3 ]— — [NH4 ]— — 1. a wean We 14...... 4am {MNHG e.- 13/1;an mm Q 4.19erte the e uation(s) for any reaction(s) which occurred wither ec to Q 4.18. M? (0H5)? + BMH ~—-w> 4| (011.53 (214 g + 3mm Q 4.201s Al(OH2)3 (011)3(5) soluble in NH4C1 solution? Answer this question by experiment. Give an account of both experiment and results. (Be careful to distinguish between dispersion and dissolution. Treatment of gelatinous precipi— tates like A1(OH2)3(OH)3(s) with electrolytic solutions, particularly if the solution is concentrated like saturated NH4C1, can disperse the precipitate into tiny globules and give the false appearance of dissolution. So be sure to examine carefully. If you seeglobules, the mixture is a disPersion and not a true solution.) 1&- 1‘5th W .41..) NHqu Mm“; £2976 a)» a. Mum; Q 4.21 Recall the solution produced by treating A1(OVH2)3 (0H)3 with 2 M NaOH (Q 4.14) Treat this solution with saturated NH4 2C31 solution and note your observations and results. , sandman-r Wflmm Q 4. 22 Write the equation for any reaction which just occurred. AiCOHab‘B (6H>3 +5NH‘1‘F r—v [4((65191 3+ + BNHB Solubility Properties of fiulfates of Mg2+ and A13”. Q 4.23 Should the sulfates of Mg2+ and A13” be soluble? Make a prediction based on your laboratory work. They 6W1 \jfi M Q 4.24 Test your answer to Q 4. 23 by experiment. Describe experiments and results. Write the equations for an reactions which occurred. W gyAi N55); walk ”mama-‘9); M Na. 1501., , film thugs). $414500? were”... Wail—min» W Mac/“59¢, + Ma .4, {‘4ng“} WW {MW Nuqcl OK 4-11 ...
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