Since our last post we are trying to get an overview of the concept of significant figures and we shall continue to do so in this post as well. Let us begin by understanding how the concept of significant figures deals with precision and accuracy.Suppose we are measuring volume of a liquid in the laboratory.This…

# Category: Analytical Chemistry

## 19.Significant Figures-I

We have been exploring the topics ‘measurements’ and ‘errors‘ in the previous few posts. Whatever we have learned till now,can be recapitulated as follows – During various calculations that we carried out during studying these parameters, we oftentimes encountered numbers with more digits after the decimal point. In such cases, we rounded off the digits. e.g….

## 18.Analysis of errors-III (Deviation & Standard Deviation).

Our last post was all about studying different parameters and formulas. In this post let us study two very important concepts, from among various parameters studied in the last post, namely – Deviation and Standard Deviation thoroughly. A]Deviation-Deviation is a simple concept to understand. It tells us how much, an individual value in a given…

## 17.Analysis of errors-II

We have been studying all about errors in the last few posts.We continue our discussion further and talk in greater detail about ways of expressing accuracy and precision in this post. We have already studied how to calculate absolute and relative error in post 15.We studied that – A.E = xi – T where, A.E ⇒ Absolute error….

## 16.Analysis of Errors-I

As mentioned in my earlier post , we start this post with the introduction of two new parameters in error analysis namely – ACCURACY & PRECISION. 1)Accuracy – • Accuracy of a measurement tells us how close the measured value (xi),is close to the true/accepted value. • Accuracy is measured in Relative error , Absolute error. 2)Precision – • It…

## 15.Calculation of Errors.

In the last post we discussed how measurements are subject to errors and the different types of errors that one might come across.In this post we shall discuss how to measure these errors and how to present our data with specifying errors in it. We begin our discussion with the concept of ‘True value –…

## 14.Errors

As mentioned in the last post, the unawareness of uncertainties in our measurement renders our experimental data insignificant.While measuring any quantity, there can be various errors incorporated in the measurement and the knowledge of these errors is essential to get accurate and precise results.Thus, today we start our discussion of Analytical Chemistry with a…