Platinum Rising
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![]() 1000 MTG cards inc 160 rares Save £300 US $78.92
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![]() Bastiodon GL 2 111 Platinum Rising Rivals Holo Pokemon Card US $.99
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calculate the percentage of ammonia in a sample if 0.2115g gave rise to 0.4693g platinum.?
Ammonaical nitrogen can be determined by treatment of the sample with chloroplatinic acid; the product is slightly soluble ammonium chloroplatinate:
H2PtCl6 + 2NH4^+ --->(NH4)2PtCl6 + 2H^+
The precipitate decomposes on ignition,yielding metaalic platinum and gaseous products:
(NH4)2PtCl6---->Pt(s) + 2Cl2(g) + 2NH3(g) + 2HCl(g)
Mole conversion: g Pt to moles Pt, and from the equation each mole Pt corresponds to 2 moles NH3, so you can find mass NH3 and % NH3 from there.
Roadmap:
Mass Pt --> moles Pt --> moles NH3 --> mass NH3 --> % NH3w
ALL comparisons of quantities of different materials go through moles, and use the balanced equation to find the exchange rate between the substances. Just remember that and you can simply churn your way through this stuff.


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