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🇵🇱 Szymon Kurpas, Karolina Naciasta 🇵🇱
🇭🇷 Nikolina Jovanov, Mihaela Božić 🇭🇷
🇳🇱 Afanaisa Richardson, Monisha Serberien 🇳🇱

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Where is the most acidic soil? In the city centre, next to the water, in the forest or near the factory?

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A measure of acidity or alkalinity of water soluble substances (pH stands for 'potential of Hydrogen'). A pH value is a number from 1 to 14, with 7 as the middle (neutral) point. Values below 7 indicate acidity which increases as the number decreases, 1 being the most acudic. Values above 7 indicate alkalinity which increases as the number increases, 14 being the most alkaline. This scale, however, is not a linear scale like a centimeter or inch scale (in which two adjacent values have the same difference). It is a logarithmic scale in which two adjacent values increase or decrease by a factor of 10.

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The most acidic soil will be in a city centre because of dense traffic that is producing a lot of exhaust gases which are causing acidic rain.
We think that Buzet (in Croatia) will have the least acidic soil in the city centre, because it does not have that much traffic.

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City centre- 7.23 pH
Next to the river- 7.76 pH
Forest- 7.31 pH
Near the factory- 7.63 pH

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City centre- 5.62 pH
Next to the river- 6.9 pH
Forest- 6.95 pH
Near the factory- 4.75 pH

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We took samples of soil in places where we have done a research. Then we put these samples in cups of distilled water and measure pH or we used pH meter.