ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: cindyy on February 23, 2010, 05:31:34 pm
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Since i have been posting quite a lot of questions up lately, i decided it was time to do this!
so here it is ...
My first question:
The initial 250mL of fertiliser solution was diluted 10 times by taking a 25mL sample from a diluted solution and diluting it to 250mL again. What is the concentration of phosphate ions in ml/L, in the initial 250mL of fertliser?
The mass of the fertiliser is 0.0310g
-thanks
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Is it me or theres not enough info to answer this question?
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That's what I was thinking... although I might be wrong, which is why I didn't post initially. What's reacting with what? And if it's a gravimetric, what's the mass of the precipitate? I presume the mass of the fertiliser is included to find the percentage purity...
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isn't fertiliser (NH3)3PO4
?
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is the answer 8.49 x 10^-4 M
?
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isn't fertiliser (NH3)3PO4
?
i dont think theres a generic type of fertiliser :s i could be wrong. u need more info.
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no need to stresss! I totally just visited my tutor before, and i figured out how to do it .... and yes, it was missing a concentration! Lol sorry!
its coz this question was from a prac, and i didnt know what the concentration was (all good now) sorry guys!
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heinemann chemistry strikes again!