Before using any chemical from a container, list three things that you shou know

Question

Before using any chemical from a container, list three things that you shou know from the label or other source. 1. 2. 3. Can chemicals be mixed in any order? Describe specifically the required order that involves mixing water and concentrated acids. No When pouring a liquid from one container to another, what technique should be used to minimize splashing? When pouring a liquid, where should you place your hand on the bottle? Explairn why Explain if it is a good idea to taste a chemical in lab to see if it is sugar or salt? Explain. Describe the correct technique to smell a chemical if instructed to do so by the lab instructor

Explanation / Answer

1.

Read labels and the material safety data sheet (MSDS) before using any material to make sure you understand hazards and precautions.

(i) Handling and Storage, Hazards Identification
(ii)  Exposure Controls/Personal Protection,
(iii) First Aid Measures, Accidental Release Measures

2.

No, chemicals shouldn't be mixed in random order.
While diluting a concentrated acid with water, concentrated acid should be added to water. Since the mixing is highly exothermic. If you add water to concentrated acid the mixing will generate heat and the added water might spill back at your face.

3.

Pouring liquids:
(a). Use the back of your fingers to remove the stopper from a reagent bottle. Hold the stopper between your fingers until the transfer of liquid is complete. Do not place the stopper on your workbench.
(b). Grasp the container from which you are pouring with the palm of your hand covering the label.
(c). When you are transferring a liquid to a test tube or measuring cylinder, the container should be held at eye level. Pour the liquid slowly, until the correct volume has been transferred.
(d). When you are pouring a liquid from a reagent bottle into a beaker, the reagent should be poured slowly down a glass stirring rod. When you are transferring a liquid from one beaker to another, you can hold the stirring rod and beaker in one hand.

4.

While transfering a liquid you should place your hand over the chemical label of the bottel.

5.

Tasting some chemicals can be dangerous or even deadly since some chemicals are highly toxic.

6.

When it is necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air toward your face. Try not to breathe in the air through your nose, but bring in just enough to make sense of the smell.

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