A second method, very commonly used, is the pseudo-order method . The indicator, methyl orange, has a strong absorbance in the visible region of the spectrum that we will use to monitor its disappearance. From the manner in which the amount of reactant decreases with time, the pseudo-order rate dependence on methyl orange will be determined. You will be working with 1 M acid solutions, which will burn the skin and clothes. In case of skin contact, flush the affected area with copious amounts of running water.
Tin salts are toxic.
Avoid ingestion and skin contact. Experimental Record all data in your notebook. Rinse with distilled water and dry thoroughly. Preparation of Solutions Develop a procedure for the preparation of 10 mL of 0.001 M methyl orange indicator in water containing 1.0 M HCl. Have your procedure checked, then carry it out.