Simple method of measuring the acid concentration using a glass fiber filter paper

摘要

The present invention method for measuring acid concentration based on the neutralization titration, poor stability of the basic solution such as sodium hydroxide solution used for the measurement, also is troublesome from the viewpoint that require more glassware consuming, it is not suitable for concentration management of day-to-day acid solution. Furthermore, analytical devices such as automatic titrator expensive, a problem to develop a new method capable of measuring a more inexpensive and simple manner acid concentration. A Discoloration area to sample solution acidic by adding an acid-base indicator that has to pH7 or less, to expand the sample solution is immersed in one end of the glass fiber filter paper, stop the deployment at any time, the entire liquid phase at that time was to expand glass deployment from the lower end of the immersed to the side of the fiber filter length L and the color of high pH side of the added acid-base indicator to measure the distance H with respect to deployment direction of the area exhibited by the acid-base indicator, the ratio H / L simple method of measuring the acid concentration to determine the acid concentration using.FIELD 7