Acids and Alkalis Lab Report

An acid is a bunch of chemicals. Acids are positively charged ions, they’re liquid and are solutions of pure compounds in water. If you want to know if one thing is an acid, you can test it through the use of litmus paper. Acids will turn litmus paper pink, whilst alkalis will turn it blue. Alkalis are negatively charged ions and are normally stable. Aim:To find out how a lot of various acids is needed to neutralize 25mls of sodium hydroxide solution (NaOH).

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Hypothesis:The strongest alkali will want the smallest quantity of an acid to cancel out and the weakest will need extra acid. Variables: Control| Independent| Dependent| The indicator, NaOH| H2SO4 HClHNO3| The chemical response between the acids and alkali. | Materials / Apparatus: * H2SO4 * HCL * HNO3 * Alkali (NaOH) * Stand * Burette * Beaker * Funnel * Bunsen Burner * Crucible * Phenolphyalein Method: 1. Pour the 25 ml of NaOH right into a beaker. 2. Drop three drops of phenolphyalein into the beaker. 3. The answer will now turn pink. . Through a funnel, pour the acid into the burette.

Start dripping a couple of drops one by one into the beaker. 6. The answer will begin getting a lighter shade of pink. 7. Stir the beaker round. eight. Once the solution turns clear, stop including more acid. 9. Calculate the amount of acid used. 10. Take the solution and pour a little bit of it right into a crucible. 11. Light the Bunsen burner. 12. The salt answer will turn into salt crystals when it is heated. NaOH + HCl = NaCl + H2O NaOH + HNO3 = NaNO3 NaOH + H2SO4 = Na2SO4 + 2H2O Observations:

Alkali| Acid| Moles| Observation| NaOH| HCL| 1 Mole| Took four ml to neutralize.

No further experiment was made. | NaOH| HCL| zero. 1 Mole| Took 31 ml to neutralize. 2. half-hour until pink salt crystals were shaped. | NaOH| HNO3| 1 Mole| Took 19. 2 ml to neutralize. 2 minutes until good white salt crystals had been fashioned. | NaOH| H2SO4| 2 Moles| Took 1. 1 ml to neutralize. 2. quarter-hour till rings of white salt have been shaped. | Analysis: The weakest acid (HCl 0. 1 Mole) needed essentially the most alkali to be made into salt and the strongest (H2SO4 2 Moles) needed the least.

Different experiments made totally different salts. Conclusion: The strongest acid will work quicker and you will need much less. This is as a end result of it’s much more reactive than the weaker acids and it’ll need to react a lot faster with the alkali. Evaluation: In my group, Zuzanna and I have been those doing the experiment whereas everyone else observed and took notes on what occurred. The first time, we dropped one too many drops of H2SO4 within the alkali so the alkali rapidly turned pink once more.

We needed to try it six instances before we may get it proper because we stored putting an extreme amount of in or we might neglect how much we put in. But after a couple of tries we finally obtained it to work and we obtained the correct answer. Therefore we could finally go on to the subsequent step and warmth up the answer. It took our salt round 2 minutes and 15 seconds to heat up, evaporate and go away us with small rings of white salt crystals. Our salt crystals did not prove as one of the best, however they had been successful.

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