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    How can magnesium metal be used to distinguish between an acid and a base?

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    What color would seawater turn if you added bromothymol blue to it
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    1. the molecular formulas of bases have a metal plus a hydroxide so Mg(OH)2 is a base
    2. acids readily reacts with a base ie: Mg + 2HCl ----> H2Mg Cl2
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    Seawater has many many substances dissolved into it, such as chlorine, sodium, magnesium, sulfur, calcium, etc. Some of these such as sulfur can form compounds with the water that can affect the pH of the seawater. So in short, you don't know what colour the bromothymol blue will be when it's added to the seawater because who knows the exact composition of the seawater. However if its pH is below 6 (acidic) bromothymol blue will be yellow and if pH is above 7.6 (basic), bromothymol blue will be blue. It'll be green if the pH is in between those two values.
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    Originally Posted by Blanchoir View Post
    1. the molecular formulas of bases have a metal plus a hydroxide so Mg(OH)2 is a base
    2. acids readily reacts with a base ie: Mg + 2HCl ----> H2Mg Cl2

    How positive are you?

    Originally Posted by Blanchoir View Post
    Seawater has many many substances dissolved into it, such as chlorine, sodium, magnesium, sulfur, calcium, etc. Some of these such as sulfur can form compounds with the water that can affect the pH of the seawater. So in short, you don't know what colour the bromothymol blue will be when it's added to the seawater because who knows the exact composition of the seawater. However if its pH is below 6 (acidic) bromothymol blue will be yellow and if pH is above 7.6 (basic), bromothymol blue will be blue. It'll be green if the pH is in between those two values.
    So what color is it?
    EDIT nvm i put green


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    Originally Posted by Mr.Roarke View Post
    How positive are you?
    lol pretty sure man and also i made another post. The seawater one im 10000000% sure of.
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    Originally Posted by Mr.Roarke View Post
    How positive are you?



    So what color is it?
    pH < 6 (acidic) bromothymol blue will be yellow
    pH > 7.6 (basic), bromothymol blue will blue

    if inbetween those values, will be green
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    Originally Posted by Blanchoir View Post
    lol pretty sure man and also i made another post. The seawater one im 10000000% sure of.
    can you make the mg one more simpilar lol
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    Uhh, it wouldn't be H2Mg because that would be a molecular bond, which are not very strong. If you do HCl + Mg, it would go to MgCl2 + H2.

    The reason you can use magnesium metal to distinguish is the first reason, because it bonds with hydroxide to form a base.
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