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Investigate the solubility of 1 cm2 of Soluble Laundry bags in different pHs and temperatures.

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Introduction

Investigating the Solubility of Laundry bags Aim: To investigate the solubility of 1 cm2 of Soluble Laundry bags in different pHs and temperatures. Equipment 3 * thermometer 3 * 250 ml beaker 3 * 500 ml beaker Tap Water Hydrochloric acid Sodium Chloride 45 * 1 cm squared pieces of Soluble Laundry bags 3 * Stirrers / spatulas Ice (00C) Room temperature water (200C) 400C water bath 600C water bath Bunsen Burner Gas Universal Indicator Stop clock Prediction From Previous work I know that most things dissolve in acid better than in lower pHs and that higher temperatures are also good for dissolving. So from this Preliminary work I predict that the shortest time to dissolve a 1 cm2 will be Hydrochloric acid at 1000C Method * Take 1 250 ml beaker and fill it with 100 ml of Hydrochloric acid. * Take 1 500 ml beaker and fill it with roughly 250 ml of ice and measure and record the temperature somewhere. ...read more.

Middle

* If you are repeating an experiment use the same equipment and solutions again and if you want to use different temperatures and pHs use the relevant one. * Repeat the experiments again for all of the pHs and the different temperatures using the appropriate solutions and temperatures * In all you should repeat each experiment three times * For 1000C turn on a Bunsen burner and wait until it boils. When it is boiling do not remove the Bunsen because it will cool down just stir it while it is boiling * For water and Sodium Hydroxide you will need result charts like these: WATER 30C 200C 400C 600C 1000C pH 7 (Water) Exp 1 pH 7 (Water) Exp 2 pH 7 (Water) Exp 3 HYDROCHLORIC ACID 30C 200C 400C 600C 1000C pH 14 (NaOH) Exp 1 pH 14 (NaOH) Exp 2 pH 14 (NaOH) ...read more.

Conclusion

Exp 2 4+ 4+ 4+ 4+ 0.38 pH 14 (NaOH) Exp 3 4+ 4+ 4+ 4+ 0.38 Conclusion From my results I have found out that my prediction was correct. The more acidic the solution and the higher the temperature the faster the soluble bags dissolved in. From the Hydrochloric acid graph I notice that as the temperature increases the faster the bags dissolve at. From the Water graph you notice that as the temperature increases at first the speed of the solubility increases rapidly between 100C and 400C and then slowly increases as the temperature increases. From the Sodium Hydroxide Graph you can straight away tell that Alkali is not the best solution for dissolving soluble laundry bags as only 1000C had an effect on dissolving it. So from this experiment we have come to a Conclusion that the higher the temperature and the more acidic the solution is the faster the soluble laundry bags will dissolve in and the lower the temperature and the more alkali the solution the longer it takes for the soluble laundry bags to dissolve. ...read more.

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