You can have as many controls as necessary, But they must remain equal at all times in order to get the most accurate results
B. climate
this is because it influences the speed of chemical reactions in the soil
The answer to this problem is a physical change
<span>The combined gas equation relates three variables pressure, temperature and volume when the number of moles is constant.
The equation is PV / T = constant. Which is valid for a fixed number of moles of the gas.
You can derive the combined gas equation from the combination of Bolye's law, Charles' law and Gay-Lussac's law, which needs some algebra.
Answer: option 2. number of moles.
</span>
pH of buffer solution : 4.32
<h3>Further explanation
</h3>
A buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.
The buffer solution can be acidic or basic
Acid buffer solutions consist of weak acids(H₂CO₃) and their salts.(NaHCO₃)
mol H₂CO₃
mol NaHCO₃
![\tt [H^+]=Ka\dfrac{mole~weak~acid}{mole~salt}\\\\(H^+]=1.8\times 10^{-5}\dfrac{0.008}{0.003}=4.8\times 10^{-5}\\\\pH=5-log~4.8=4.32](https://tex.z-dn.net/?f=%5Ctt%20%5BH%5E%2B%5D%3DKa%5Cdfrac%7Bmole~weak~acid%7D%7Bmole~salt%7D%5C%5C%5C%5C%28H%5E%2B%5D%3D1.8%5Ctimes%2010%5E%7B-5%7D%5Cdfrac%7B0.008%7D%7B0.003%7D%3D4.8%5Ctimes%2010%5E%7B-5%7D%5C%5C%5C%5CpH%3D5-log~4.8%3D4.32)
