Alkalinity is usually imparted by bicarbonate, carbonate and hydroxide. Obtain ~500 mL of at least one of the following available samples. Pipet a 100.00 mL aliquot into a 250 mL beaker and record the initial pH prior to adding any HCl. The alkalinity of water is a measure of its capacity to neutralize acids. It is an aggregate property of the water sample and can be interpreted in terms of specific substances only when a complete chemical composition of the sample is also performed. After determining the Alkalinity and Acidity, the student will identify any possible problems expected from discharging the AMD sample into a stream. (In the past, pH was defined in terms of hydrogen ions [H +], but the nomenclature has changed to reflect the fact that hydrogen ions are almost always complexed with a water molecule.) This guideline describes the procedure for the electrometric determination of pH of an undiluted aqueous formulation; or, the pH of an aliquot of formulation mixed with distilled or deionized water. It is defined as the negative logarithm of the hydronium ion [H 3 O +] concentration. In between this time stirring can be done. The procedure of determination of pH of water involves the following steps: The water sample is properly mixed and stirred using a glass rod; By using a watch glass, sample of water equal to 40ml (5ml more or less) is added to the beaker. Alkalinity measures the acid-neutralizing capacity of a water sample. It is primarily due to salts of weak acids, although weak or strong bases may also contribute. acidity or buffering ability of the sample. Basically, pH is a measure of acidity or alkalinity of a solution. 2. Mainly, it is due to carbonate, bicarbonate & hydroxide ion present in water or the mixture of two ions present in water. 3. Dissolve the Na2CO3 in about 75 mL of deionized water and titrate to pH 4.2 (or appropriate colour change). DETERMINATION OF PH, ACIDITY AND ALKALINITY INTRODUCTION 1. While completing the titration, the student will demonstrate proficiency in measuring pH and performing a titration. Alkalinity of water means acid neutralization capacity of water. Determination of Alkalinity of samples 1. Preparation of dilute HCl titrant 1. When you add acid in water (adding H + ions) water absorbs H + ions without showing significant change in pH. While pH can be directly determined by potentiometry with ion-selective electrodes, the determination of total alkalinity and acidity requires titrimetric approaches. The temperature of the water is allowed to stabilize by placing the sample stand for 1 hour. It is measured volumetrically by titration with 0.02 N sulphuric acid and is reported in terms of CaCO3 equivalent.