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Acid-base indicators - explore some of the properties of selected acid-base indicators and measure the pH of some common solutions.

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Introduction

Acid-base indicators - explore some of the properties of selected acid-base indicators and measure the pH of some common solutions. Acid-base indicators Aim: In this practical you will explore some of the properties of selected acid-base indicators and measure the pH of some common solutions. Theory: The pH of a solution is a measure of the hydrogen ion concentration. A pH below 7 indicates an acidic solution, a pH greater than 7 indicates an alkaline solution, while a pH of 7 indicates a neutral solution. A range of indicators is used in chemistry because a particular indicator tells us a great deal about its chemical properties. Method: (part A) 1. Your teacher will provide a range of acid-base indicators in the laboratory. Indicators can be in paper of liquid form. ...read more.

Middle

Red pH 3 Yellow pH 6 Blue pH 9 Litmus Red/pink. Red No change No Bromothymol blue Yellow Yellow/orange No change No Questions: Which of the above indicators could you choose to test the pH of a solution of (a) pH = 3, (b) pH= 6, (c) pH =9? You could use the universal indicator as in the tests taken out these three results were shown so this indicator pointed out that these results can be found as was in vinegar, pure water and NaOH. How might you measure the exact pH at which a particular indicator changes colour? You could measure this with a colour indicator that shows particular colours and what their pH is when this colour change takes place. ...read more.

Conclusion

Explain. Some substances used around the household such as cleaning products (ammonia, limewater etc.) are very high in acidity, which means that certain cleaning products must be high in acid to clean. Beverages are a lot lower in and means that are more base type solutions, which are more suitable for consuming. Why is universal indicator more useful for this second exercise? As we know the colours in which that they change to with the universal indicator as to their pH level Conclusion: In conclusion from this practical we can see that from using different substances to test certain products for the pH level. We have found how certain things we use everyday have different levels of pH and that we can see why they are used for this purpose and why they are made for this purpose. ...read more.

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