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Explain the two assumptions involved in the Ka weak acid dissociation equation.

On the numerator of the Ka equation, the concentration of protons is written as being squared due to the fact the concentration of protons is equal to the concentration of the conjugate base in solution.On t...
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Answered by Lucas L. • Chemistry tutor
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Explain the Bohr shift.

The Bohr shift should be explained using the relative affinities of haemoglobin to carbon dioxide and oxygen due to changes in pH level. When pCO2 is high in cells (i.e in muscle cells when one is exercising...
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Answered by Lucas L. • Biology tutor
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The gradient of a curve is given by dy/dx = 6sqrt(x) + 2. The curve passes through the point (16, 38). Find the equation of the curve.

dy/dx = 6x 1/2 + 2 y = (6 2/3)x 3/2 + 2x + c = 4x 3/2 + 2x + c 38 = (4 16 3/2 ) + (2*16) + c c = 38 - 256 - 32 = -250 y = 4x 3/2 + 2x - 250
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Answered by Fraser W. • Maths tutor
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How do you integrate (x/(x+1)) dx without using substitution.

A tricky question which is actually really simple if you know the technique and will save a lot of time during the exam. The method is to simply add 1 and minus one to the numerator. so the integral becomes ...
Answered by • Maths tutor
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Differentiate 3x^(3) + 7x^(2) -4x

Using the formula for differentiation: if y=a x N then dy/dx= N a*x N-1 apply this to each term in the equation given; first term: dy/dx= 9x 2 second term: dy/dx= 14xthird term: dy/dx= - 4Combining all three...
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Answered by Michelle W. • Maths tutor
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