Re: q u e s t i o n s -- Chemistry

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Date Posted: 00:46:49 11/04/01 Sun
Author: Lim Yee Lian
Subject: Re: q u e s t i o n s
In reply to: tze may 's message, "q u e s t i o n s" on 05:20:41 11/03/01 Sat

Q2)Carbon Dioxide bubbled into limewater forms white ppt(calcium carbonate). Thus substance reacts with more carbon dioxide to form soluble calcium hydrogencarbonate(soluble in water). That's why colourless solution formed. {PG 415}
[This is out of syllabus]
Q3)Metals in Gp1 formed soluble hydroxide.(Sodium hydoxide,potassium hydoxide)Whereas Gp2 metals they form hydroxides which are slightly soluble only if not are insoluble.(calcium hydroxide-limewater(slightly soluble,magnesium hydroxide is insoluble)
Q6)Metals are reducing agents-only in displacement reactions with less reactive metals.Metals which are more reactive will displace the ions of less reactive metals in the reactivity series,from solutions.(PG 192)
Q7)Only metals are classified in the reactivity series.As for carbon, carbon is a non-metal.Carbon is a rducing agent as well... It can take oygen away from oxides of metals that are not high up in the reacttivity series.(middle of the reactivity series.eg:zinc,copper,iron etc)[PG 194]
Q5)Potassium sulphate is a soluble salt...That's why it can prepared by titration method....Potassium hydrogen sulphate is also a salt formed by reacting sulphric acid and potassim hyroxide.
H2SO4+2KOH ---K2SO4+H2O
(potassium sulphate)
It can also formed another substance.
H2SO4+KOH ----KHSO4+H2O
I don't know how to modify the experiment to get the product.(SORRY)
Q4)Calcium sulphate is an insoluble salt. When calcium carbonate reacts with Hydrocloric acid,the substances are calcium chloride(soluble salt) ,water and carbon dioxide...
But I don't know why are there more bubbles(SORRY)
Q1)I dun know as well....
Hope my answers can be of little help to u!!:)

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[> [> k2so4 Crystallisation -- asanda, 08:00:33 04/10/05 Sun

how do your go about writing a (LAab)report on K2SO4 crystallision

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[> [> [> Re: k2so4 Crystallisation -- asanda, 08:01:52 04/10/05 Sun

>how do your go about writing a (LAab)report on K2SO4
>crystallision

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