When heavy metals such as lead (Pb), mercury (Hg), cadmium (Cd) and arsenic (As) build up in the body they can become toxic. Chelation therapy is a useful tool to treat heavy metal poisoning. In this medical procedure special drugs that can act as ligands are used to bind strongly to these metal ions. The resulting metal-drug complexes are readily excreted from the body thus lowering heavy metal concentration to safe levels.
A measure of how effectively these drugs will bind to and remove heavy metal ions is the equilibrium constant, K.
Company ABC Ltd. has developed a potential new compound for chelation therapy. It reacts with Pb as shown in the equation below.
Pb2+ + drug Pb(drug)2+
Solutions of Pb2+ and the new drug were mixed and allowed to react until equilibrium was attained.
The following solutions were mixed:
100 cm3 of 1.00 x 10-3 mol dm-3 Pb2+
100 cm3 of 2.00 x 10-3 mol dm-3 drug
After equilibrium was attained, the mixture had a concentration of 1.00 x 10-4 mol dm-3 of the Pb(drug)2+ complex.
Use the information provided and follow the steps below to determine the equilibrium constant, K, for the reaction.
The total volume of the mixture is Answer cm3
The moles of Pb2+ added at the start of the reaction is Answer
The moles of drug added at the start of the reaction is Answer
The moles of Pb(drug)2+ at equilibrium is Answer moles
The moles of Pb2+ at equilibrium is Answer moles
The moles of drug at equilibrium is Answer moles
The concentration of Pb2+ at equilibrium is Answer mol dm-3
The concentration of drug at equilibrium is Answer mol dm-3
The equilibrium constant is:
The Answer the K value the more effectively a chelation drug will perform. Therefore this new compound is Answer effective than the existing treatment which has a K of 1 x 108.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.Read more
Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.Read more
Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.Read more
Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.Read more
By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.Read more