TITRATION OF ACIDS & BASES EXTENSION Soil pH & Plant Growth flowers pre-school s
ID: 1058204 • Letter: T
Question
TITRATION OF ACIDS & BASES EXTENSION Soil pH & Plant Growth flowers pre-school student will tell you violets are blue, for might seem fixed; any The color of example. However, the color of flowers depends on a lot of environmental factors, including how acidic or basic the soil shows a very clear difference is the hydrangea. In the s One flower that eastern US where soil acidic, hydrangeas are blue while in the Midwestern states, where soil is is basic or are chemicals responsible for this change are known as aline, rangeas pink. The anthocyanins. The structures shown here provide the chemical structure of an anthocyanin in an acidic environment (pH 3) compared to the structure present in a basic environment (pH Notice that in acidic ts, there is a protonated oxygen (-o at is deprotonated in basic environment environments to a charged oxygen. Basic soil. plbl1 Acidic Soil. pH3 1. If you want to test the acidity of the soil without waiting for hydrangea growth, you can add (acetic acid) and see if there is any reaction. Is the soil acidic or basic when you observe a reaction? Explain why. 2. If you treat your soil with lime (CaooH)zo. which color of hydrangea do you expect to grow? Why? I 103Explanation / Answer
1. To test the soil, adding acetic acid to it would show If soil is acidic or basic. If no reaction occured the soil is acidic. However, If we see a reaction occuring, acid-base reaction is exothermic in nature, the soil is basic. We see basic soil reacting with the added acid.
2. If we add line a base Ca(OH)2, the hydrangea would be blue in color.
3. Under neutral pH (pH = 7) condition, the anthocyanin would give a purple coloration to the solution. this can be tested by adding more base to the solution and seeing the color change from purple to blue in basic medium.
4. moles of NaOH used = 0.0001 M x 7 ml = 0.0007 mmol
moles of humic acid (dibasic) present = 0.0007/2 = 0.00035 mmol
concentration of humic acid in solution = 0.00035/50 = 0.007 mM
5. Peat is added to soil near a water source.
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