Pre-Laboratory Assignment What harads should you be aware of when working with 1

Question

Pre-Laboratory Assignment What harads should you be aware of when working with 1M HCL 1M NaOH? ? Answer the following questions about the procedure you will follow in this experiment How will you proceed if your juice sample contains a substainal amount of pulp? What indicator will you use for your titrations? How will you recognize the end point of the titration? What assumption will you make about the acid in fruit juice when doing the calculations (or this experiment? Following the Procedure for this experiment, a student titrated 200 mL of grapefruit juice with 0. 1030M NaOH. The titration required 10. 63 ml. ol NaOH to reach endpoint Calculate the number of moles oi NaOH required foe the titration

Explanation / Answer

1(a) HCl is corrosive and its vapor is suffocating can affect various organ. Personal protective equipments (PPE) are must during the handling of HCl.

(b) NaOH is a strong alkali, corrosive in nature can be dangerous if swallowed. PPE is must for handling NaOH.

2.(a) The pulp should be filtered out before starting the experiment.

(b) Juice is acidic in nature so phenolphthalein indicator is used.

(c) The neutral solution (end point) will become purple in colour.

3. The aicd is fully ionized in fruit juice and soluble in water.

4. Volume of NaOH = 10.63 mL and strength = 0.1030 M

So, by definition,

1000 mL 1 M requires 1 mol of NaOH

10.63 ml 0.103 M has = 10.63*0.103/1000 = 1.09x10-3 moles of NaOH

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