1. If you want to test the acidity of the soil withough waiting for hydrangea gr
ID: 1057046 • Letter: 1
Question
1. If you want to test the acidity of the soil withough waiting for hydrangea growth, you can add vinegar (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 (Ca(OH)2), which color of hydrangea do you expect to grow? Why?
3. The anthocyanin in hydrangeas can be isolated and used as an environmentally friendly pH indicator for titrations. At the end of a titration reaction of a strong acid with a strong base, you have a neutral solution. What color do you expect anthocyanin to be at the end of a titration? Describe a lab experiment to support your prediction.
4. To increase the acidity of soil, you can add peat, which contains a complex acid mixture known as humic acid. The complexity of the humic acid makes it difficult to deterrmine how acidic you are making the soil. You decide to use a titration to get a better measure. If titration of a 50.9 mL extraction from the peat requires 6.7 mL of 1.0 nM sodium hydroxide, what is the concentration of humic acid in the peat? Note: humic acid acts as a diprotic acid (two acidic protons)
5. Adding anything to soil should be carefully considered. Look up the Accidental Release Measures of the SDS for humic acid. Should you add peat to soil near a creek or other water source? Provide the exact phrasing that supports your answer.
Explanation / Answer
After adding vinegar If soil fizzes,soil is alkaline (pH above 7 )
the fizzing is due to formation of CO2 gas due to reaction between added acid and
base present in soil.
hydrangea contains anthrocyanins. This compound changes its color depending on pH.
if ph is low the colour is red, purple or of similar shade.
Now here we are addding lime which is basic in nature, we will get pH basic. (>7)so
greenish or yellowish shaded hydrangea.
At neutral pH the colour will be bluish or purple.
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