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Freeman Newton |
Have you tried consulting chemistry reference books in the library? I'm sure somewhere out there, some scientist has studied this and has some published results. I would start with the CRC Handbook [link is to product info at Amazon] and Chemical Engineers Handbook [link is to info about book at Amazon].
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Tim Neveau |
1 - Solution (1moldm-3)
2 - pH
3 - Temperature
4 - Weight before (g)
5 - Weight after (g)
6 - % of weight lost
1 2 3 4 5 6
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0.1 H2SO4 0.91 20†C 2.304 2.244 2.604
0.01 H2SO4 1.92 20†C 2.299 2.289 0.435
0.001 H2SO4 2.88 20†C 2.301 2.279 0.956
0.0001 H2SO4 4.51 20†C 2.309 2.285 1.039
1x10-5 H2SO4 5.01 20†C 2.297 2.279 0.784
1x10-6 H2SO4 6.59 20†C 2.290 2.289 0.044
pH7 Buffer 7.00 20†C 2.298 2.298 0.000
Tap water 6.45 20†C 2.296 2.272 1.045
0.1 NaCl N/A 20†C 2.276 2.246 1.318
0.01 NaCl N/A 20†C 2.295 2.258 1.612
0.001 NaCl N/A 20†C 2.246 2.230 0.712
0.0001 NaCl N/A 20†C 2.297 2.280 0.740
1x10-5 NaCl N/A 20†C 2.251 2.229 0.977
1x10-6 NaCl N/A 20†C 2.301 2.284 0.739
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0.1 H2SO4 0.91 40†C 2.297 2.077 9.578
0.01 H2SO4 1.92 40†C 2.286 2.242 1.925
0.001 H2SO4 2.88 40†C 2.261 2.213 2.123
0.0001 H2SO4 4.51 40†C 2.210 2.186 1.086
1x10-5 H2SO4 5.01 40†C 2.293 2.285 0.349
1x10-6 H2SO4 6.59 40†C 2.303 2.281 0.955
pH7 Buffer 7.00 40†C 2.289 2.289 0.000
Tap water 6.45 40†C 2.287 2.265 0.962
0.1 NaCl N/A 40†C 2.302 2.279 0.999
0.01 NaCl N/A 40†C 2.282 2.219 2.761
0.001 NaCl N/A 40†C 2.297 2.263 1.480
0.0001 NaCl N/A 40†C 2.300 2.276 1.043
1x10-5 NaCl N/A 40†C 2.297 2.284 0.566
1x10-6 NaCl N/A 40†C 2.295 2.277 0.784
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0.1 H2SO4 0.91 60†C 2.297 2.022 11.972
0.01 H2SO4 1.92 60†C 2.284 2.225 2.583
0.001 H2SO4 2.88 60†C 2.295 2.263 1.394
0.0001 H2SO4 4.51 60†C 2.299 2.281 0.783
1x10-5 H2SO4 5.01 60†C 2.296 2.256 0.436
1x10-6 H2SO4 6.59 60†C 2.297 2.276 0.914
pH7 Buffer 7.00 60†C 2.243 2.243 0.000
Tap water 6.45 60†C 2.258 2.250 0.354
0.1 NaCl N/A 60†C 2.268 2.254 0.617
0.01 NaCl N/A 60†C 2.299 2.256 1.870
0.001 NaCl N/A 60†C 2.303 2.253 2.171
0.0001 NaCl N/A 60†C 2.304 2.286 0.781
1x10-5 NaCl N/A 60†C 2.290 2.278 0.524
1x10-6 NaCl N/A 60†C 2.292 2.275 0.742
Marc Griffiths
- UK
Thank you Marc with his chart. I recently posted a question inquiring whether loss of mass occurs with rusting, and your chart clearly shows that it does, now I can proceed with my experiment. We are currently testing with different salt concentration's effect on the rusting of iron, what is the explanation that with an increase in salt concentration, increase of iron rusting occurs? And does it matter if the metal is submerged in water, will it still work if it was hung above the solution?
Joey
- Los Angeles, California
Hello,
I was wondering Joey, how did your experiment turn out? Did lower
concentrations of NaCl produce higher amounts of rust, or was it the
other way around. I am very interested to see what happened.
Thank you,
John Cook
- Sydney, Australia
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September 24, 2009 I've done an experiment for 'does salt affect the rate of rusting' and put 4 steel nails in 4 test tubes. one in air, one in filtered water, one in water that has 1 teaspoon of salt in it and one in 1 tablespoon of salty water. i know salt makes thing rust more but when i finished the experiment the nail in filtered water rusted the most! i told my science teacher this and she just gave me a look that said this is what's supposed to happen. can you tell me what was supposed to have happened? i've done the experiment 4 times and they all had the same results. Alanna B
September 23, 2009 Hi, Alanna. Your results are your results, and when you've done it four times it's not a fluke. I think your teacher's "look" may have been meant to convey that. I don't know where Mark G. got the chart he has posted, but it shows that, depending on the temperature, tap water caused more corrosion than certain levels of salt in the water. Salt water is more conductive than filtered water, and thus it probably accelerates corrosion when there are multiple metals in contact, because it allows ions to flow through the solution better. But when it's just steel in solution, I'm not sure that there is an easily explained scientific reason to expect salty water to rust it faster than tap water -- and, as mentioned, your results are your results and there is no reason to discount them. Regards,
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