If you dont have sodium hydroxide and sulphuric acid then you could use vinegar and washing soda. Although you will not be able to reach the very high and very low pHs, but is isen too bad. Just a few things about indicators, acid and bases. A chemical is not an acid (or base), nothing is inherently one thing or another. An acid or base is defined by the reaction taking place. There are two basic definition of the acid. Theres the Brønsted-Lowry acid which is a proton (H+) donor and the Lewis acid which is a loin pair (electrons) acceptor. For example; hydrogen chloride gas is bubble through water. The H Cl bond brakes and the molecule is ionized into a H+ and a Cl-. The HCl is adding H+ ions to the water so its a Brønsted-Lowry acid. And the water is acting as the base because its a proton excerptor. This is the classic example of a acid reaction but there are other reactions to look out for. An indicator is usually a large organic molecule (with a few double bonds here and there, also an aromatic system). When protons are added (acid) or removed (basic) then this changes the electronic environment of the molecule. As such this changes the kinds of wavelength of light that can be absorbed. So this changes the colour. I am thinking about doing a video on these ideas plus buffers but I will only do it if there is interest. (I would hate to bore you (even though is an interesting subject! (Well I think so( :D )))))
Monday, November 26, 2012
The Colourful World Of Indicators
The Colourful World Of Indicators Video Clips. Duration : 6.13 Mins.
If you dont have sodium hydroxide and sulphuric acid then you could use vinegar and washing soda. Although you will not be able to reach the very high and very low pHs, but is isen too bad. Just a few things about indicators, acid and bases. A chemical is not an acid (or base), nothing is inherently one thing or another. An acid or base is defined by the reaction taking place. There are two basic definition of the acid. Theres the Brønsted-Lowry acid which is a proton (H+) donor and the Lewis acid which is a loin pair (electrons) acceptor. For example; hydrogen chloride gas is bubble through water. The H Cl bond brakes and the molecule is ionized into a H+ and a Cl-. The HCl is adding H+ ions to the water so its a Brønsted-Lowry acid. And the water is acting as the base because its a proton excerptor. This is the classic example of a acid reaction but there are other reactions to look out for. An indicator is usually a large organic molecule (with a few double bonds here and there, also an aromatic system). When protons are added (acid) or removed (basic) then this changes the electronic environment of the molecule. As such this changes the kinds of wavelength of light that can be absorbed. So this changes the colour. I am thinking about doing a video on these ideas plus buffers but I will only do it if there is interest. (I would hate to bore you (even though is an interesting subject! (Well I think so( :D )))))
If you dont have sodium hydroxide and sulphuric acid then you could use vinegar and washing soda. Although you will not be able to reach the very high and very low pHs, but is isen too bad. Just a few things about indicators, acid and bases. A chemical is not an acid (or base), nothing is inherently one thing or another. An acid or base is defined by the reaction taking place. There are two basic definition of the acid. Theres the Brønsted-Lowry acid which is a proton (H+) donor and the Lewis acid which is a loin pair (electrons) acceptor. For example; hydrogen chloride gas is bubble through water. The H Cl bond brakes and the molecule is ionized into a H+ and a Cl-. The HCl is adding H+ ions to the water so its a Brønsted-Lowry acid. And the water is acting as the base because its a proton excerptor. This is the classic example of a acid reaction but there are other reactions to look out for. An indicator is usually a large organic molecule (with a few double bonds here and there, also an aromatic system). When protons are added (acid) or removed (basic) then this changes the electronic environment of the molecule. As such this changes the kinds of wavelength of light that can be absorbed. So this changes the colour. I am thinking about doing a video on these ideas plus buffers but I will only do it if there is interest. (I would hate to bore you (even though is an interesting subject! (Well I think so( :D )))))
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