7. A few drops of bromothymol blue indicator are placed into 250 mL of 0.20 mol/L HCl(aq). A sample of 1.8 g of NaOH(s) is then dissolved into this solution. The final colour of the solution is predicted to be
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What is the pH of the HCl solution? THen, dissolve the 1.8 g NaOH. Which is in excess? With that excess, what the the resultant pH?
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The pH of the HCl solution is approximately 0.20. After dissolving the 1.8 g of NaOH, the solution will be in excess of the HCl, resulting in a pH of approximately 11. The final colour of the solution will be blue.
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