Chloride Content - Qualitative & Volhard's Method

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Order the processes correctly for water soluble chloride content, both the qualitative check and Volhard's method

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Ben

Reino Unido

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Chloride Content - Qualitative & Volhard's Method


Chloride Content - Qualitative & Volhard's MethodVersión en línea Order the processes correctly for water soluble chloride content, both the qualitative check and Volhard's method por Ben 1 Water soluble Chloride Content - Overview Prepare your soil sample, sieved passing 2mm and oven dried. Prepare reagents and standardise your thiocyanate solution, record the concentration Start the qualitative check, agitating a soil solution for 4h Add Thiocyanate solution until it turns cloudy to red, recording the volume to calculate results Set aside 50g of soil sample for a qualitative check, and 75g for Volhard's method Precipitate the chlorides with silver nitrate solution from a burette, recording the volume Start Volhard's method - mix the sample with water and filter for 100ml of clear filtrate filter the qualitative sample and test for chlorides present with silver nitrate solution. 2 Standardisation of Thiocyanate Solution Concentration C = 2.5 / (V1) Thiocyanate Solution (0.1 mol/L) = 8.5g of ammonium thiocyanate dissolved in 1L of distilled water Record the volume of thiocyanate solution added (V1) Then add 5ml nitric acid solution and 1ml ferric alum indicator. Transfer 25ml silver nitrate solution to 250ml conical flask. Add Thiocyanate solution from a burette into the flask until the first permanent colour change 3 Qualitative check for Chlorides Add five drops of silver nitrate solution and allow to stand for 10 minutes Add 50g soil sample in a 500ml conical flask. Add a few drops of nitric acid to acidify the now clear solution. Agitate the solution for 4h and allow to settle. If no turbidity is apparent, the soluble chloride content of the soil is negligible for construction Add approximately equal mass of distilled water. Filter the supernatant solution through Whatman No. 40 filter paper. 4 Preparation of water-soluble chloride extract Agitate the solution for at least 16h Filter the suspension using Whatman No. 40 until 100ml of clear filtrate has been collected If filtrate is not clear, filter again using Whatman No. 42 for 100ml of clear filtrate. Place 75g of soil specimen in a suitable container, with twice that mass of distilled water added. 5 Chloride analysis using Volhard's method Add 2ml of trimethylhexanol, add stopper, and shake vigorously. Rinse stopper into flask on removal. Add silver nitrate solution from a burette until all chloride has been precipitated Calculate chloride ion content = 0.007092 [ V2 - 10( C x V3 ) ] Record volume of silver nitrate added (V2) Add 5ml of ferric alum indicator solution Add standardised thiocyanate solution from a burette until the first permanent colour change occurs Record the volume of thiocyanate solution added (V3) Transfer 100ml of filtered extract into a 250ml conical flask, then add 5ml nitric acid solution

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Chloride Content - Qualitative & Volhard's Method

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Chloride Content - Qualitative & Volhard's MethodVersión en línea

por Ben

Water soluble Chloride Content - Overview

Standardisation of Thiocyanate Solution

Qualitative check for Chlorides

Preparation of water-soluble chloride extract

Chloride analysis using Volhard's method