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pH Lab Report - testing household liquids
- Essay length: 493 words
- Submitted: 04/01/2012
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Marked by teacher:
Patricia McHugh
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Reviewed by:
07/07/2012
Teacher essay summary
Awarded 3 stars as it is a good piece of work for this level. They could have used more scientific knowledge in their introduction to show their knowledge and understanding of acids and bases. The hypothesis has not been justified and there is no indication as to where they have got their predictions from. A good method is used and a good basic analysis of results. An improvement would be to refer to the results in the analysis and discuss if their hypothesis was proved correct or not. Shows some good understanding. It would be good to add in a section on any improvements they could make to their method.
Marked by teacher Patricia McHugh 01/12/2012
The first 200 words of this essay...
Alyssa Bellave Living Environment
10/26/11 Mrs. Padilla
pH Lab
Introduction: Substances, even household substances, can be acidic, basic, or neutral. Acids and bases are called aqueous solutions, or mixtures of certain substances dissolved in water. The amount of acidity or basicity can be measured by using the pH scale. The scale runs from 1-14. The scale has to do with the amount of hydrogen ions [resent in a substance.
Hypothesis: Our hypothesis for this experiment consists of twelve different substances. The tomato juice will be acidic; the distilled water will be neutral; the Windex will be basic; the vinegar will be basic; the soda will be basic; the milk will be neutral; the buttermilk will be neutral; the baking soda solutions will be acidic; the "green" cleaner will be basic; the household cleaner will be acidic; the Lemon Juice will be acidic.
Materials: For this lab we need pH paper, a spot plate, water (distilled, if available), and substances with varying pH.
Safety: In this lab we must were goggles and aprons to avoid skin contact with all chemicals that are going to be used in this experiment. If it does happen,
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Review of essay
Rating: 3 star(s)
Response to the question
Overall a good basic piece which understands the properties of acids and bases well for this level of qualification. The candidate explains why the different household substances have the properties they do in a chemical way. The candidate was wrong in some instances and did not justify their hypothesis or why they were wrong which should have been improved.
Level of analysis
Good hypothesis although the scientific reasoning behind the experiment is not explained, although it is hinted at in the introduction. The method could be bullet pointed or numbered so it is clear where each step comes. The candidate gives a data table but I'm not sure if these are the results and the candidate does not state if these results correlated correctly with their hypothesis. The analysis is explained well, and explains why the experiment happened the way it did.
Quality of writing
Minor spelling mistakes present. Otherwise, spelling, grammar and punctuation seem okay.
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MbT essay summary
Awarded 3 stars as it is a good piece of work for this level. They could have used more scientific knowledge in their introduction to show their knowledge and understanding of acids and bases. The hypothesis has not been justified and there is no indication as to where they have got their predictions from. A good method is used and a good basic analysis of results. An improvement would be to refer to the results in the analysis and discuss if their hypothesis was proved correct or not. Shows some good understanding. It would be good to add in a section on any improvements they could make to their method.
