how do i answer this question
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Kittyful this graph works on the basis that a strong base + a strong acid = neutral salt, a strong base + weak acid = basic salt, a strong acid + weak base = acidic salt. When doing questions like this, where they present you with a graph, you want to look at the points where it drops, at the middle of this "dropping" is the equivalence point and the eq. point is indicative of the pH of the salt. In this case, if you get a rule and measure the midpoint of the dropping in the solid curve, you can notice that the midpoint is around 7, therefore the salt is neutral because of this we know that the reaction was between a strong base and strong acid (it could also be weak base weak acid), we then look at the dotted curve, and do the same method.. we measure the midpoint and notice it lies around 5. This shows that the salt is acidic and was therefore made from a strong acid and weak base. =)