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0.1 M sodium hydroxide (strong base) is added to 25 ml of 0.1 M of ethanoic acid (weak acid) in a titration. What is the pH at equivalence?

The equivalence point is reached when the titrant added neutralizes the titrand. It is thought that when a solution is neutral it would have a pH of 7. However, the combination of a weak acid and a strong ba...
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Answered by Sean P. Chemistry tutor
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Factorise: y = x^2 + 5x + 6

With quadratic equations, there are two ways in which to answer Firstly (and most simply), look for two numbers that multiply to make c and add up to make b in the equation y = ax 2 + bx + c , so in the exam...
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Answered by Adnan N. Maths tutor
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Can you show me why the integral of 1/x is the natural log of x?

We can break this down into steps, going deeper each time. First we might just say: well, since integration is fundamentally the inverse process of differentiation and we know that the derivative of ln(x) is...
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Answered by James L. Maths tutor
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What is the function of T-helper cells?

T-helper cells are a kind of lymphocyte that are a key part of the adaptive immune system. The adaptive immune system is largely coordinated by T cells, of which there are several types, and B cells, the oth...
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Answered by Theo F. Biology tutor
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How do you expand brackets?

Let's have a look at a pair of brackets: (a+b)(c+d)To expand these brackets each value in one bracket must be multiplied by all values in the other bracket separately then added together. So we have: ac+ad+b...
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Answered by Phoebe B. Maths tutor
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