Using weight to find volume

[Marama T]

Lately I've been using weight to measure the volume of water. One mL of water weighs one gram, so if I need 100mL of 10% NaCl solution, I'll weigh out 10g of salt and then make it up to 100g with distilled water. Surely this is more precise than most glassware. I use it for lots of solutions, as long as the density of the solute is around 1g/mL. Any thoughts?

[bigmack]

Actually sounds like a great idea Marama

I was wondering how much the temp of the water would throw the accuracy (as density changes with temp ) , but it looks pretty damn good up to at least room Temp .But at higher temps it is still significantly more than glassware .

°C .0 .1 .2 .3 .4 .5 .6 .7 .8 .9
0 0.999843 0.999850 0.999856 0.999863 0.999869 0.999875 0.999880 0.999886 0.999892 0.999897
1 0.999902 0.999907 0.999911 0.999916 0.999920 0.999925 0.999929 0.999932 0.999936 0.999940
2 0.999943 0.999946 0.999949 0.999952 0.999955 0.999957 0.999960 0.999962 0.999964 0.999965
3 0.999967 0.999969 0.999970 0.999971 0.999972 0.999973 0.999974 0.999974 0.999975 0.999975
4 0.999975 0.999975 0.999974 0.999974 0.999973 0.999973 0.999972 0.999971 0.999970 0.999968
5 0.999967 0.999965 0.999963 0.999961 0.999959 0.999957 0.999954 0.999952 0.999949 0.999946
6 0.999943 0.999940 0.999936 0.999933 0.999929 0.999925 0.999922 0.999917 0.999913 0.999909
7 0.999904 0.999900 0.999895 0.999890 0.999885 0.999879 0.999874 0.999868 0.999863 0.999857
8 0.999851 0.999845 0.999839 0.999832 0.999826 0.999819 0.999812 0.999805 0.999798 0.999791
9 0.999784 0.999776 0.999768 0.999761 0.999753 0.999745 0.999737 0.999728 0.999720 0.999711
10 0.999702 0.999694 0.999685 0.999675 0.999666 0.999657 0.999647 0.999638 0.999628 0.999618
11 0.999608 0.999598 0.999587 0.999577 0.999566 0.999556 0.999545 0.999534 0.999523 0.999512
12 0.999500 0.999489 0.999477 0.999466 0.999454 0.999442 0.999430 0.999417 0.999405 0.999393
13 0.999380 0.999367 0.999355 0.999342 0.999328 0.999315 0.999302 0.999288 0.999275 0.999261
14 0.999247 0.999233 0.999219 0.999205 0.999191 0.999176 0.999162 0.999147 0.999133 0.999118
15 0.999103 0.999087 0.999072 0.999057 0.999041 0.999026 0.999010 0.998994 0.998978 0.998962
16 0.998946 0.998930 0.998913 0.998897 0.998880 0.998863 0.998847 0.998830 0.998813 0.998795
17 0.998778 0.998761 0.998743 0.998725 0.998708 0.998690 0.998672 0.998654 0.998635 0.998617
18 0.998599 0.998580 0.998561 0.998543 0.998524 0.998505 0.998486 0.998467 0.998447 0.998428
19 0.998408 0.998389 0.998369 0.998349 0.998329 0.998309 0.998289 0.998269 0.998248 0.998228
20 0.998207 0.998186 0.998166 0.998145 0.998124 0.998103 0.998081 0.998060 0.998039 0.998017
21 0.997995 0.997974 0.997952 0.997930 0.997908 0.997886 0.997864 0.997841 0.997819 0.997796
22 0.997773 0.997751 0.997728 0.997705 0.997682 0.997659 0.997635 0.997612 0.997589 0.997565
23 0.997541 0.997518 0.997494 0.997470 0.997446 0.997422 0.997397 0.997373 0.997349 0.997324
24 0.997299 0.997275 0.997250 0.997225 0.997200 0.997175 0.997149 0.997124 0.997099 0.997073
25 0.997048 0.997022 0.996996 0.996970 0.996944 0.996918 0.996892 0.996866 0.996839 0.996813
26 0.996786 0.996760 0.996733 0.996706 0.996679 0.996652 0.996625 0.996598 0.996571 0.996543
27 0.996516 0.996488 0.996461 0.996433 0.996405 0.996377 0.996349 0.996321 0.996293 0.996264
28 0.996236 0.996207 0.996179 0.996150 0.996121 0.996093 0.996064 0.996035 0.996006 0.995976
29 0.995947 0.995918 0.995888 0.995859 0.995829 0.995799 0.995770 0.995740 0.995710 0.995680
30 0.99565 0.99562 0.99559 0.99556 0.99553 0.99550 0.99547 0.99544 0.99541 0.99537
31 0.99534 0.99531 0.99528 0.99525 0.99522 0.99519 0.99516 0.99512 0.99509 0.99506
32 0.99503 0.99500 0.99496 0.99493 0.99490 0.99487 0.99484 0.99480 0.99477 0.99474
33 0.99470 0.99467 0.99464 0.99461 0.99457 0.99454 0.99451 0.99447 0.99444 0.99441
34 0.99437 0.99434 0.99431 0.99427 0.99424 0.99420 0.99417 0.99414 0.99410 0.99407
35 0.99403 0.99400 0.99396 0.99393 0.99390 0.99386 0.99383 0.99379 0.99376 0.99372
36 0.99369 0.99365 0.99361 0.99358 0.99354 0.99351 0.99347 0.99344 0.99340 0.99337
37 0.99333 0.99329 0.99326 0.99322 0.99319 0.99315 0.99311 0.99308 0.99304 0.99300
38 0.99297 0.99293 0.99289 0.99286 0.99282 0.99278 0.99274 0.99271 0.99267 0.99263
39 0.99260 0.99256 0.99252 0.99248 0.99244 0.99241 0.99237 0.99233 0.99229 0.99225
40 0.99222 0.99218 0.99214 0.99210 0.99206 0.99202 0.99199 0.99195 0.99191 0.99187
41 0.99183 0.99179 0.99175 0.99171 0.99167 0.99163 0.99159 0.99156 0.99152 0.99148
42 0.99144 0.99140 0.99136 0.99132 0.99128 0.99124 0.99120 0.99116 0.99112 0.99108
43 0.99104 0.99100 0.99095 0.99091 0.99087 0.99083 0.99079 0.99075 0.99071 0.99067
44 0.99063 0.99059 0.99055 0.99050 0.99046 0.99042 0.99038 0.99034 0.99030 0.99025
45 0.99021 0.99017 0.99013 0.99009 0.99004 0.99000 0.98996 0.98992 0.98988 0.98983
46 0.98979 0.98975 0.98971 0.98966 0.98962 0.98958 0.98953 0.98949 0.98945 0.98941
47 0.98936 0.98932 0.98928 0.98923 0.98919 0.98915 0.98910 0.98906 0.98901 0.98897
48 0.98893 0.98888 0.98884 0.98879 0.98875 0.98871 0.98866 0.98862 0.98857 0.98853
49 0.98848 0.98844 0.98839 0.98835 0.98831 0.98826 0.98822 0.98817 0.98813 0.98808
50 0.98804 0.98799 0.98794 0.98790 0.98785 0.98781 0.98776 0.98772 0.98767 0.98763
51 0.98758 0.98753 0.98749 0.98744 0.98740 0.98735 0.98730 0.98726 0.98721 0.98716
52 0.98712 0.98707 0.98702 0.98698 0.98693 0.98688 0.98684 0.98679 0.98674 0.98670
53 0.98665 0.98660 0.98655 0.98651 0.98646 0.98641 0.98636 0.98632 0.98627 0.98622
54 0.98617 0.98613 0.98608 0.98603 0.98598 0.98593 0.98589 0.98584 0.98579 0.98574
55 0.98569 0.98564 0.98560 0.98555 0.98550 0.98545 0.98540 0.98535 0.98530 0.98525
56 0.98521 0.98516 0.98511 0.98506 0.98501 0.98496 0.98491 0.98486 0.98481 0.98476
57 0.98471 0.98466 0.98461 0.98456 0.98451 0.98446 0.98441 0.98436 0.98431 0.98426
58 0.98421 0.98416 0.98411 0.98406 0.98401 0.98396 0.98391 0.98386 0.98381 0.98376
59 0.98371 0.98366 0.98361 0.98355 0.98350 0.98345 0.98340 0.98335 0.98330 0.98325
60 0.98320 0.98314 0.98309 0.98304 0.98299 0.98294 0.98289 0.98283 0.98278 0.98273
61 0.98268 0.98263 0.98257 0.98252 0.98247 0.98242 0.98237 0.98231 0.98226 0.98221
62 0.98216 0.98210 0.98205 0.98200 0.98194 0.98189 0.98184 0.98179 0.98173 0.98168
63 0.98163 0.98157 0.98152 0.98147 0.98141 0.98136 0.98131 0.98125 0.98120 0.98115
64 0.98109 0.98104 0.98098 0.98093 0.98088 0.98082 0.98077 0.98071 0.98066 0.98061
65 0.98055 0.98050 0.98044 0.98039 0.98033 0.98028 0.98022 0.98017 0.98011 0.98006
66 0.98000 0.97995 0.97989 0.97984 0.97978 0.97973 0.97967 0.97962 0.97956 0.97951
67 0.97945 0.97940 0.97934 0.97929 0.97923 0.97918 0.97912 0.97906 0.97901 0.97895
68 0.97890 0.97884 0.97878 0.97873 0.97867 0.97861 0.97856 0.97850 0.97845 0.97839
69 0.97833 0.97828 0.97822 0.97816 0.97811 0.97805 0.97799 0.97794 0.97788 0.97782
70 0.97776 0.97771 0.97765 0.97759 0.97754 0.97748 0.97742 0.97736 0.97731 0.97725
71 0.97719 0.97713 0.97708 0.97702 0.97696 0.97690 0.97684 0.97679 0.97673 0.97667
72 0.97661 0.97655 0.97650 0.97644 0.97638 0.97632 0.97626 0.97620 0.97614 0.97609
73 0.97603 0.97597 0.97591 0.97585 0.97579 0.97573 0.97567 0.97562 0.97556 0.97550
74 0.97544 0.97538 0.97532 0.97526 0.97520 0.97514 0.97508 0.97502 0.97496 0.97490
75 0.97484 0.97478 0.97472 0.97466 0.97460 0.97454 0.97448 0.97442 0.97436 0.97430
76 0.97424 0.97418 0.97412 0.97406 0.97400 0.97394 0.97388 0.97382 0.97376 0.97370
77 0.97364 0.97358 0.97352 0.97345 0.97339 0.97333 0.97327 0.97321 0.97315 0.97309
78 0.97303 0.97297 0.97290 0.97284 0.97278 0.97272 0.97266 0.97260 0.97253 0.97247
79 0.97241 0.97235 0.97229 0.97223 0.97216 0.97210 0.97204 0.97198 0.97191 0.97185
80 0.97179 0.97173 0.97167 0.97160 0.97154 0.97148 0.97142 0.97135 0.97129 0.97123
81 0.97116 0.97110 0.97104 0.97098 0.97091 0.97085 0.97079 0.97072 0.97066 0.97060
82 0.97053 0.97047 0.97041 0.97034 0.97028 0.97022 0.97015 0.97009 0.97003 0.96996
83 0.96990 0.96983 0.96977 0.96971 0.96964 0.96958 0.96951 0.96945 0.96939 0.96932
84 0.96926 0.96919 0.96913 0.96906 0.96900 0.96893 0.96887 0.96881 0.96874 0.96868
85 0.96861 0.96855 0.96848 0.96842 0.96835 0.96829 0.96822 0.96816 0.96809 0.96803
86 0.96796 0.96790 0.96783 0.96776 0.96770 0.96763 0.96757 0.96750 0.96744 0.96737
87 0.96731 0.96724 0.96717 0.96711 0.96704 0.96698 0.96691 0.96684 0.96678 0.96671
88 0.96664 0.96658 0.96651 0.96645 0.96638 0.96631 0.96625 0.96618 0.96611 0.96605
89 0.96598 0.96591 0.96585 0.96578 0.96571 0.96565 0.96558 0.96551 0.96544 0.96538
90 0.96531 0.96524 0.96518 0.96511 0.96504 0.96497 0.96491 0.96484 0.96477 0.96470
91 0.96463 0.96457 0.96450 0.96443 0.96436 0.96430 0.96423 0.96416 0.96409 0.96402
92 0.96396 0.96389 0.96382 0.96375 0.96368 0.96361 0.96355 0.96348 0.96341 0.96334
93 0.96327 0.96320 0.96313 0.96306 0.96300 0.96293 0.96286 0.96279 0.96272 0.96265
94 0.96258 0.96251 0.96244 0.96237 0.96230 0.96224 0.96217 0.96210 0.96203 0.96196
95 0.96189 0.96182 0.96175 0.96168 0.96161 0.96154 0.96147 0.96140 0.96133 0.96126
96 0.96119 0.96112 0.96105 0.96098 0.96091 0.96084 0.96077 0.96070 0.96063 0.96056
97 0.96049 0.96042 0.96035 0.96027 0.96020 0.96013 0.96006 0.95999 0.95992 0.95985
98 0.95978 0.95971 0.95964 0.95957 0.95949 0.95942 0.95935 0.95928 0.95921 0.95914
99 0.95907 0.95899 0.95892 0.95885 0.95878 0.95871 0.95864 0.95856 0.95849 0.95842


from here.
https://www.internetchemistry.com/chemi ... -table.php

[RosalieL]

I would imagine that for high school science either weight or volume would be accurate enough. This is where the % w/w or % w/v etc comes in. If you're weighing both it would be % w/w and if weighing the solid and measuring the liquid it would be % w/v. Mixing two liquids (eg Hcl) would be % v/v. Happy to be corrected if I've got that wrong. For specific molarities I always use a volumetric flask.

[Anna Z]

I would imagine that for high school science either weight or volume would be accurate enough. This is where the % w/w or % w/v etc comes in. If you're weighing both it would be % w/w and if weighing the solid and measuring the liquid it would be % w/v. Mixing two liquids (eg Hcl) would be % v/v. Happy to be corrected if I've got that wrong. For specific molarities I always use a volumetric flask.

This... heheheee to funny. exactly what I was thinking.