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increase the usage of solar energy and reduce the usage of gas...
A base will increase the pH of a solution as it will lower the available H+ ions.
If electrons are left behind in metal this will increase the voltage difference between a metal electrode and a solution. Also if the solution becomes more positive this will cause an increase.
In order to increase the concentration of a solution, you must add more solute or remove some solvent. You can remove solvent through evaporation.
Yes. Diffusion will increase the entropy.
they increase the H+
Adding a base
increasing the temperature or pressure
The term 'solubility of a solution' is meaningless. Perhaps you mean how do you increase the solubility of a solute in a solvent? In that case, if your solute is a solid, increase the temperature, and if it is a gas, decrease the temperature.
rate of solution
That depends on what solid you add and what the solution is of. Adding more of the same salt to a solution will just increase the concentration, unless it is saturated. Adding a different salt will increase the concentration of all parts, unless one of the possible salts that can be formed is not very soluble and will precipitate. Adding a hydroxide to an acidic solution will result in neutralisation and adding an acid to a basic solution will as well. There are many more possible combinations that could be used, and will have different results.