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Formic acid (CH2O2) is used as an antibacterial on livestock feed. A sample of formic acid has been found to have a pH = 3, and data shows it has a Ka = 1.6E-4 M. What is the concentration of the sample?

This question tests your knowledge on weak acids, pH, Ka and equilibrium. (Note: E notation has been used, E-3 is x10 -3 ). Formic acid is a weak acid and so does not fully dissociate, the degree of dissocia...
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Answered by Kieran O. • Chemistry tutor
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what is the median, mode and mean?

the mean is the average value when you add together all of the numbers in your sample and then divide the result by the amount of numbers in the sample.the mode is the most common number in the sample, the o...
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Answered by Amit E. • Maths tutor
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Explain and critically evaluate the Ontological argument for the existence of God.

The Ontological argument (in its most famous form) was originally proposed by Saint Anselm of Canterbury. He argued that if we define God as "a being than which no greater can be conceived", God mu...
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What is a sense organ?

A sense organ is a specialise organ, with a cluster of receptor cells that sense changes in the environment.
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Answered by Amber M. • Biology tutor
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How much thermal energy does a 1 kg steel block with a specific heat capacity of 450 J/kg°C lose when it cools from 400°C to 60°C?

E=mc 0 E = 1 x 450 x (400-60)E = 1 x450 x 340E = 153,000J
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Answered by Maisy H. • Physics tutor
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