Question

could this experiment have been done in a different order? for example, fe filing being removed at the end of the scheme. Why or Why not?

Here is the procedure:

INTRODUCTION Most of the matter around us con combination of two or more Mixtures have the following fundamental proper natter around us consists of mixtures of different substances. A mixture results from the tivo or more pure substances, elements or compounds that do not react chemically. • Each component of a . Mixtures can be separated into mponent of a mixture retain its chemical identity and hence its own properties. can be separated into these components by physical means. . Composition of a mix position of a mixture may vary while that of its components is fixed. materials in our daily life, such as rocks, soil, seawater, cement, wood, are examples homogeneous as well as heterogeneous. This experiment deals with the components of a heterogeneous mixture and not with their identification. Physical like magnetic property, solubility etc. will be utilized in the separation techniques. Most common materials in our dat of mixtures. Mixtures can be homogeneous as well as heterogeneo separation of the components of a heterogeneous properties like magnetic property, solubilit ods used depend upon the differences in physical properties between the components. Methods of separation commonly used are: Decantation Separation of a liquid from a solid (sediment) by gently pouring the liquid from the solid without disturbing the solid. Filtration Separation of a solid from a liquid by means of a porous material, a filter which allows the passage of the liquid but not the solid. Extraction Separation of a component of a mixture by preferentially dissolving it in a suitable solvent while the other components stay in an insoluble form The mixture in this experiment will contain three components: iron filings, salt (NaCl), and sand (SiO). The flow chart for the separation is given below: Use a magnet Mixture (Fe filings, NaCl, SiO) - Fe removed weight loss Residue remaining Measure Fe content by Residue from extraction (NaCl + SiO) - wet sand dries to constant weight Sio, (weigh sand) extract with water heat to dryness NaCl solution - NaCl (weigh salt)

Answer 1

The order of procedure which is given above is correct and we can’t remove the Fe at the end because when mixture is dissolved in water and after thre extraction of NaCl when the wet sand is heated with iron some of the iron react with SiO2.   

And iron can also react with hot water at high temperature so our mixture will not remain the same and component will chemically react together to give different compound.

so we can’t do the experiment in different order.