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November 08, 2025, 04:03:24 am
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Author Topic: Cindyy's Question Thread!  (Read 1171 times)  Share 

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cindyy

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Cindyy's Question Thread!
« 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
« Last Edit: February 23, 2010, 05:44:58 pm by cindyy »
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Studyinghard

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Re: Cindyy's Question Thread!
« Reply #1 on: February 23, 2010, 07:18:59 pm »
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Is it me or theres not enough info to answer this question?
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appianway

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Re: Cindyy's Question Thread!
« Reply #2 on: February 23, 2010, 07:21:22 pm »
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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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stonecold

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Re: Cindyy's Question Thread!
« Reply #3 on: February 23, 2010, 07:22:46 pm »
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isn't fertiliser (NH3)3PO4
?
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stonecold

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Re: Cindyy's Question Thread!
« Reply #4 on: February 23, 2010, 07:29:19 pm »
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is the answer 8.49 x 10^-4 M
?
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superflya

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Re: Cindyy's Question Thread!
« Reply #5 on: February 23, 2010, 07:30:52 pm »
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Quote from: stonecold on February 23, 2010, 07:22:46 pm
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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cindyy

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Re: Cindyy's Question Thread!
« Reply #6 on: February 23, 2010, 07:34:52 pm »
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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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coletrain

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Re: Cindyy's Question Thread!
« Reply #7 on: February 23, 2010, 07:36:08 pm »
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heinemann chemistry strikes again!
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