why use pka instead of ka?
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The reason pKa is used is because it describes acid dissociation using small decimal numbers. The same type of information may be obtained from Ka values, but they are typically extremely small numbers given in scientific notation that are hard for most people to understand.
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A large Kb value indicates the high level of dissociation of a strong base. A lower pKb value indicates a stronger base. pKa and pKb are related by the simple relation: pKa + pKb = 14.
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A measure of the strength of an acid on a logarithmic scale. The pK value is given by log10(1/Ka), where Ka is the acid dissociation constant. pK values are often used to compare the strengths of different acids. From: pK value in A Dictionary of Chemistry »
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pKa (acid dissociation constant) and pH are related, but pKa is more specific in that it helps you predict what a molecule will do at a specific pH. Essentially, pKa tells you what the pH needs to be in order for a chemical species to donate or accept a proton.
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FSK has several advantages over ASK due to the fact that the carrier has a constant amplitude. hence, its immunity to non-linearities, immunity to rapid fading, immunity to adjacent channel interference, and the ability to work in small SNR environments due to the effect of exchanging SNR for bandwidth.
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The lower the pKa, the stronger the acid and the greater its ability to donate protons. pH depends on the concentration of the solution. This is important because it means a weak acid could actually have a lower pH than a diluted strong acid. ... On the other hand, the pKa value is constant for each type of molecule.
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D. The pH is a measure of the concentration of hydrogen ions in an aqueous solution. pKa (acid dissociation constant) and pH are related, but pKa is more specific in that it helps you predict what a molecule will do at a specific pH.
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KHP is slightly acidic, and it is often used as a primary standard for acid-base titrations because it is solid and air-stable, making it easy to weigh accurately. It is not hygroscopic.
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To create a more manageable number, chemists define the pKa value as the negative logarithm of the Ka value: pKa = -log Ka. If you already know the pKa value for an acid and you need the Ka value, you find it by taking the antilog. In practice, this means raising both sides of the equality to exponents of 10.
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KHP is a good standard because it can be stored as a stable powder that does not absorb water from the air. So, we can measure out a known mass easily using a balance and calculate the number of moles from the mass.
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The key difference between Kc and Kp is that Kc is the equilibrium constant given by the terms of concentration whereas Kp is the equilibrium constant given by the terms of pressure. This equilibrium constant is given for reversible reactions.
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Simply Ka value indicates how easily the acid loses a proton. If Pka value is high then the acid is weak while Pka value low means the stronger acid. Pka value indicates the strength of the acid.
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Cpk is more widely used than Cp, since it takes into account the mean and the standard deviation in its calculation. ... When the average of the process approaches the target value, the gap between Cpk and Cp closes. When the average of the specification is equal to the target value, then Cpk is equal to Cp.
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As the acid or the base being titrated becomes weaker (its pKa or pKb becomes larger), the pH change around the equivalence point decreases significantly. With very dilute solutions, the curve becomes so shallow that it can no longer be used to determine the equivalence point.
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Ka is the acid dissociation constant. pKa is simply the -log of this constant. Similarly, Kb is the base dissociation constant, while pKb is the -log of the constant. The acid and base dissociation constants are usually expressed in terms of moles per liter (mol/L).
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Equilibrium constants are sometimes called keq values. If you are experimenting with an acid-base reaction, the keq value is Ka, also known as acidity constant, which measures the strength of an acid in solution.
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Potassium bicarbonate works just fine. The difference is that the carbonate form is a more reactive, more caustic material and so fewer places carry it. The bicarbonate form is "safer" and so much more readily available.