Can someone please explain the gradient of a pH curve when you titrate a strong acid with a strong base, or weak acid with a weak base or strong acid with a weak base etc.
I'm not entirely sure what your asking, but I hope this helps!
The gradient is the rate of change. A low gradient would mean the pH doesn't change very drastically when solution is added, a larger gradient would cause a more rapid change in pH.
This is a strong acid and weak base. You could find graphs with weak acid etc on the internet or your textbook
From this, you can see that when you start adding base, initially the graph isn't very steep (low gradient), so adding base only increases the pH a small amount.
As you approach the equivalence point, the graph gets steeper (higher gradient), so adding a small amount of base will cause a greater rise in pH. This rapid change in pH is what may lead you to overshoot the endpoint during a titration as the colour of the indicator changes rapidly (as the pH rapidly changes).
The graph then flattens out (low gradient), as adding more base increases the pH by less and less each time.
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