relationship between pH value and rate of photosynthesis

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GROUP 4 PROJECT-CHEMISTRY PRACTICAL REPORT

NAME: ZHUANG YUAN           CLASS: 5.08 KINGS

Background information

pH influences the rate of photosynthesis. University students and scientists have conducted experiments showing how pH affects the rate of photosynthesis. The result shows that in pH 7.5 solution leaves produce oxygen the fastest and those in pH 4.5 the slowest( using pH 4.5, 5.5, 6.5 and 7.5). (Source from the internet:  )

pH of the solution is determined by the H+ ion in the solution. In pond water, there are many ions present at well. Do they influence the rate as well?

Purpose

Test the relationship between the pH value of water and different ions present to the rate of photosynthesis in plants.

Hypothesis

The closer the pH value is to neutral(pH=7) and fewer ions present, the faster the rate of photosynthesis.

Variables

Equipment and apparatus

Procedure

  • Test the pH of different pond water using data logger
  1. pour 100ml of sampled water into five different beakers
  2. attach the pH sensor to the data logger
  3. dip sensor end of the data logger into the sampled water
  4. allow the sensor to stay in the water for a time of one minute
  5. record the pH level of the water
  6. repeat (5) for each water sample
  7. repeat the process twp more times and calculate the average pH level for each water sample( as to increase the accuracy of the date logger)
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  • to prove data logger gives the correct range of pH and amount of ions present
  1. add all different types of indicator to a small portion of each sampled water
  2. record the observation
  1. to know which contains more ions than others
  1. add NaOH and acidified , phenolphthalein respectively to each sampled water
  2. observe whether precipitate forms or not and compare the amount of precipitate

Data collection and observation

Table of pH level of collected sample of pond water

Observation when different chemicals are added

Universal indicator: very dark green

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