by test of litmus paper
Use a pH-paper.
most bottles will not have the pH of the liquid inside, so you will need a pH test strip to know the pH of the liquid inside the bottle.
find the PH of it
To choose a buffer solution based on pH for your experiment, first determine the desired pH range for your experiment. Then, select a buffer solution with a pKa value closest to the desired pH. This will help maintain the pH of your solution within the desired range and prevent drastic changes in pH during the experiment.
the pH of a neutral liquid, which is water, is neither acidic or basic, therefore it pH value is between 7and8 or 7.5 in the ph scale
hydrochloric acid and battery acid have a pH of about 1 hope that helped!
If you combine the two together, you will get a neutral liquid.
You can measure the pH of an unknown liquid using a pH meter or pH test strips. Simply dip the pH meter or test strip into the liquid and observe the reading or color change, respectively. This will give you an indication of the pH level of the unknown liquid.
The inflexion point
To find the equivalence point in a titration experiment, one can use an indicator that changes color at the pH of the equivalence point. Alternatively, a pH meter can be used to monitor the pH of the solution during the titration. The equivalence point is reached when the amount of titrant added is stoichiometrically equivalent to the amount of analyte present.
Since a perfectly neutral liquid such as distilled water has a pH of 7, a liquid with a pH of 7.1 is just very slightly alkaline. Perhaps it has a bit of soap in it.
Pure liquid water has a neutral pH of 7.