explain how a concentrated solution of a weak acid could have the same ph and similar reactions to a dilute solution of a strong acid​

Draw two cyclic constitutional isomers of cis-1

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !