In a titration experiment, if the initial solution pH is 4.0 and the equivalence point occurs at pH 9.0, then the reaction corresponds to

What is the difference between equivalence point and end point on a titration curve. Illustrate.

Indicators can be used to help approximate the pH of a solution based on the indicator colour. Here is an example of how to word the pH approximation for bromothymol blue.  Indicator Colour    pH approximation  Yellow    6.0 and below  Green    between 6.0 and 7.6  Blue    7.6 and above A Chemistry experiment is done where the pH of various solutions are tested, using indicators. The colours of indicators are recorded as shown below. Indicator Colour pH approximation orange IV orange            Indicator Colour pH approximation thymol blue red         Indicator Colour pH approximation alizarin yellow R red

If the concentration of the strong base sodium hydroxide is 0.10 M and it is titrated with 0.1 M HCl, Calculate the pre-titration pH, the pH at 1/2-way to the equivalence point, and the pH at the equivalence point.