scan0006 - Q 2.19 Report your method and result for the...

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Unformatted text preview: Q 2.19 Report your method and result for the K“ test. TMWW aWfi-Lvtmtl 9% fiW‘Z’E, m CL‘LvJLaWWW NHHXW CUM W Mmmmwww 05K“: Q 2.20 Based on your work in section 4., give a detailed account of a_ll steps involved regarding how to test a solution for K+ via precipitation if the solution contains NH4 + Include a description of all pertinent observations and results. (Check your test by experiment if you desire.) K3 Test for H 0*. Recall that there are no stable solids which contain H3O+ at high concentration under normal laboratory conditions. But, if such solids existed, a pH test on a water solution of the solid would be the simplest method available for the detection of H30+. Q 2.21 Note that by following directions for the preparation of solutions of water— soluble, unknown solids (see p. 2-6), initial concentrations on the order of 0.1 M — 0.2 M will be obtained. (Keep this in mind when you do unknown analysis!) Based on this, What sort of pH would be produced if a solid contained H30+ as an ionic constituent? Test for H0". Since HO’ reacts with many metal ions to form semisoluble substances, it is possible to test for HO’ by precipitation. Nevertheless, since H0" is the strongest B/L base which can exist in aqueous solution at high concentration, it is more common to test for H07 via pH. Use indicators to determine the pH of 0.1 M NaOH. (Note: In order to be used in a reliable fashion, the HIC indicator solution on the reagent shelf must be deep blue. If it is not, have it replaced at the stockwindow.) 2—14 ...
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