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Math Help - Soil pH colour meanings.

  1. #1
    Member Sazza's Avatar
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    Question Soil pH colour meanings.

    The information below is used for the next three questions
    Indicator paper used to test the pH of some soils had these colours.
    pH Colour
    1 Crimson
    3 Pale red
    5 Orange
    7 Yellow
    9 Pale green
    10 Green
    12 Turquoise
    14 Blue

    I know when you are measuring liquid that yellow is for acid, but what would the colour yellow indicate for a soil pH?
    Last edited by CaptainBlack; May 22nd 2007 at 07:52 PM.
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Sazza View Post
    The information below is used for the next three questions
    Indicator paper used to test the pH of some soils had these colours.
    pH Colour
    1 Crimson
    3 Pale red
    5 Orange
    7 Yellow
    9 Pale green
    10 Green
    12 Turquoise
    14 Blue


    I know when you are measuring liquid that yellow is for acid, but what would the colour yellow indicate for a soil pH?
    Umm, according to your table, it would be pH 7, which is neutral.

    what exactly are you asking?
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    Member Sazza's Avatar
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    I have to find out, what pH yellow indicates.
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Sazza View Post
    I have to find out, what pH yellow indicates.
    which is what i don't get. you have the answers in the table you provided, just look it up. where you see yellow in the table, the pH beside it is 7, so pH 7 is what you are looking for. 7 is the pH for neutral compounds, so a color of yellow indicates that the soil is neutral
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    Grand Panjandrum
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    Quote Originally Posted by Sazza View Post
    The information below is used for the next three questions
    Indicator paper used to test the pH of some soils had these colours.
    pH Colour
    1 Crimson
    3 Pale red
    5 Orange
    7 Yellow
    9 Pale green
    10 Green
    12 Turquoise
    14 Blue

    I know when you are measuring liquid that yellow is for acid, but what would the colour yellow indicate for a soil pH?
    pH 7, do you know what pH 7 signifies?

    RonL
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    Member Sazza's Avatar
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    would the colour turquoise mean strong base?
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Sazza View Post
    would the colour turquoise mean strong base?
    the lower the pH the more acidic it is, the higher the pH, the more basic it is. a pH of 7 indicates it is neutral

    for turquoise we have a pH of 12, that is close to 14, so yes, i'd say we have a relatively strong base
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    is up to his old tricks again! Jhevon's Avatar
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    for acids: 0 < pH < 7
    for bases: 7 < pH <or= 14
    for nuetral substances: pH = 7


    there are some substances with pH greater than 14, but these are VERY rare, so most textbooks don't even consider them. as far as you are concerned, the highest pH possible is 14. the closer we are to 14 the stronger the base, the closer we are to 0, the stronger the acid, and nuetral is 7
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