**This article is written by O level Chemistry tutor - Mr Chong. This article is suit able for those in Secondary 3 / 4 and those taking iGCSE.** Hi all, Thank you for viewing this blog for the past months and I welcome you if you are a new viewer. I have closed this post and started a new blog post titled “Tips for 2025 students” You may just read up on a few of the topics I mention below. The more reading you do, the more confident you are in the O level Chemistry exams. It should be a consolation, that your O level exams are likely going be easier than your prelim exams; but this is no time to let down your guard. The most important thing now is to work on your weaknesses and not let the examiners exploit them. My students sometimes beat about the bush but do not answer the questions with the critical key word s; so please know what answering style is expected. Hi, do not worry if you have tuition with me, that I will ask you t...
For d, can I say that knowing the volume of aspirin solution used is not necessary because we only need to find the mass of aspirin reacted and this can be directly calculated by finding out the number of moles of NaOH used, because we are already given the relative molecular mass of aspirin.
ReplyDeleteFor f, is the answer to titrate a solution of aspirin with NaOH, and then evaporate to saturate the resulting solution, and then cool to crystallise the sodium salt, which is then obtained by filtration and dried between sheets of filter paper.
hi urbancityowl, you are correct! Thanks for your answers.
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