Tender For supply of hydrochloric acid as per is 265 (q3) , copper sulphate (v2) as per is 261 (q3) , nitric acid (v2) as per is 264 (q3) , potassium hydroxide / caustic potash as per is 6831 (q3) , sulphur powder as per is:3383 (q3) , ammonia solution 25% (q3) , phenolphthalein indicator (q3) , ferrous sulphate (q3) , potassium iodide as per is 7163 (q3)