INORGANIC ANALYSIS: Chemical analysis is used to ascertain either the identity or the quantity of a species in a sample. ACCURACY AND RELIABILITY: In the areas of science, engineering, industry, and statistics, the accuracyof a measurement system is the level of closeness of measurements of aquantity to that quantity's real (true) value. OR PERHAPS Accuracy is usually how close a tested value should be to the actual (true) value. OR Accuracy is the level of conformity of a measured or perhaps calculated volume to its actual (true) benefit. PRECISION: The precision of a dimension system, likewise called reproducibility or repeatability, may be the degree where repeated measurements under unchanged conditions demonstrate sameresults. Although the 2 words reproducibility and repeatability can besynonymous in colloquial use, they are purposely contrasted in the context of the scientific technique. OR Precision is just how close the measured ideals are to each other. OR precision is the degree where further measurements or computations show the same or similar results. In other words, the precision of an experiment/object/value is a measure of the trustworthiness of the research, or how reproducible the experiment is definitely. The accuracy of an experiment/object/value is known as a measure of just how closely the experimental effects agree with a real or acknowledged value. COMPARABILITY CHART:
Improve this chart| Accuracy| Accuracy
Explanation: | The degree of closeness to true value. | The degree to which an instrument or process will certainly repeat the same value. | Measurements: | Single| Multiple measurements happen to be needed| Regarding: | A term used in measuring a process or unit. | A term used in measuring a process or unit. | Uses: | Physics, engineering, stats etc . | Physics, engineering, statistics and so forth | http://www.diffen.com/difference/Accuracy_vs_Precision
Case in point: One can declare a dimension is correct but not exact; precise however, not accurate; nor or both. An example of bad precision and good precision can be: Suppose a research laboratory refrigerator retains a constant temperature of 38. zero F. A temperature sensor is analyzed 10 times in the refrigerator. The temperatures through the test produce the temperature ranges of: 37. 8, 32. 3, 37. 1, 38. 0, thirty seven. 6, 38. 2, 38. 0, 37. 0, thirty seven. 4, 32. 3. This kind of distribution shows no remarkable tendency toward a particular benefit (lack of precision) although each worth does come close to the actual temperature (high accuracy).
In the Iodometry, this is depending on the oxidation process of iodide into iodine. Iodometry can be used for determine the amount of oxidizing agents. The number of oxidizing agent is determined by titration of iodine with thio sulfate. Starch is used as indicator. The end point detection is based on the formation of blue starch complex. Iodometric titration (oxidation of iodide) is done in two steps. �
Very first step
The first step is carried out by the reaction between the oxidizing agents (KMnO4, K2Cr2O7, CuSO4, peroxides etc) and KI (excess) in neutral or in weakened acidic moderate. Thus the iodine is usually quickly liberated.
KI + Oxidizing agent → I2 (or)�
2I- ↔ I2 + 2e-�
K2Cr2O7 + 6KI + 7H2SO4 → Cr2 (SO4)3 + 4K2 SO4 + 7H2O + 3I2 Second step
In this step, the separated iodine (in first step) is titrated with normal solution of sodium thiosulfate. Starch is employed as indicator. At the end stage, the blue or purple color of starch indicator disappears due to change of iodine to iodide. So the titration in which separated iodine (from potassium iodide) is titrated with a regular solution of sodium thiosulfate is known as iodometric titration. Thus the reaction is� I2 + Na2S2O3 → 2NaI + Na2S2O4�
2S2O32- + I2 → S4O62- + 2I-
This can be the principle reaction which reveals the reduction of iodine. Thus the halogens, oxy halogens, cupric ions, peroxides, sulfur dioxide in meals industry and so forth can be...