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(1) Antimony: Dissolve 2.7426 g antimony
potassium tartrate hemihydrate (analytical reagent grade), K(SbO)C4H40 6 •
1/2 H20, in 1000 mL water: 1.00 mL = 1.00
mgSb.
(2) Bismuth: Dissolve 1.000 g bismuth metal
in a minimum volume of 1 + 1 HN03•
Dilute to 1.000mL with 2% (v/v) HN03;
1.00 mL = 1.00 mg Bi.
(3) Cadmium: Dissolve 1.000 g cadmium
metal in a minimum volume of 1 + 1 HC!.
Dilute to 1000 mL with water; 1.00 mL =
1.00mgCd.
(4) Calcium: To 2.4972 g CaC03 add 50 mL
water and add dropwise a minimum
volume of cone. HCl (about 10 mL) to
complete solution. Dilute to 1000 mL
with water: 1.00 mL = 1.00 mg Ca.
(5) Cesium: Dissolve 1.267 g cesium chloride,
CsCl, in 1000 mL water: 1.00 mL = 1.00
mgCs.
(6) Chromium: Dissolve 2.828 g anhydrous
potassium dichromate, K2Cr04' in about
200 mL water, add 1.5 mL cone. HN03,
and dilute to 1.000 mL with water: 1.00
mL = 1.00 mg Cr.
(7) Cobalt: Dissolve 1.407 g cobaltic oxide,
C020 3, in 20 mL hot cone. HC!. Cool and
dilute to 1.000 mL with water: 1.00 mL =
1.00 mg Co.
(8) Copper: Dissolve 1.000 g copper metal in
15 mL of 1 + 1 HN03, and dilute to 1000
mL with water: 1.00 mL = 1.00 mg Cu.
(9) Gold: Dissolve 0.1000 g gold metal in a
minimum volume of aqua regia. Evaporate to dryness, dissolve residue in
5 mL cone. HCl, cool, and dilute to
100 mL with water; 1.00 mL = 1.00 mgAu.
(10) Iridium: Dissolve 1.147 g ammonium
chloroiridate, (NH4)zIrCI6, in a minimum volume of 1 % (v/v) HCl and dilute
to 100 mL with 1 % (v/v) HCl; 1.00 mL =
5.00 mg Ir.
(11) Iron: Dissolve 1.000 g iron wire in 50 mL
of 1 + 1 HN03 and dilute to 1000 mL
with water: 1.00 mL = 1.00 mg Fe.
(12) Lead: Dissolve 1.598 g lead nitrate,
Pb(N03)z, in about 200 mL water,
add 1.5 mL cone. HN03, and dilute to
1000 mL with water; 1.00 mL = 1.00 mg
Pb.
(13) Lithium: Dissolve 5.324 g lithium carbonate, LhC03, in a minimum volume
of 1 + 1 HCl and dilute to 1000 mL with
water; 1.00 mL = 1.00 mg Li.
4 The Measurement Process in Chemistry
(14) Magnesium: Dissolve 4.952 g magnesium
sulphate, MgS04, in 200 mL water, add
1.5 mL cone. HN03, and dilute to 1000
mL with water; 1.00 mL = 1.00 mg Mg.
(15) Manganese: Dissolve 3.076 g manganous
sulphate, MnS04' H20, in about 200 mL
water, add 1.5 mL cone. HN03, and
dilute to 1000 mL with water; 1.00 mL =
1.00mgMn.
(16) Nickel: Dissolve 1.273 g nickel oxide,
NiO,in a minimum volume of 10% (v/v)
HCl and dilute to 1000 mL with water;
1.00 mL = 1.00 mg Ni.
(17) Platinum: Dissolve 0.1000 g platinum
metal in a minimum volume of aqua
regia and evaporate just to dryness. Add
5 mL conc.HCland 0.1 g NaCl,and again
evaporate just to dryness. Dissolve
residue in 20 mL of 1 + 1 HCl and dilute
to 100 mL with water; 1.00 mL = 1.00 mg
Pt.
(18) Potassium: Dissolve 1.907 g potassium
chloride, KCl, in water and make up to
1000 mL; 1.00 mL = 1.00 mg K.
(19) Rhodium: Dissolve 0.412 g ammonium
hexachlororhodate, (NH4hRhCI6 • 1.5
H20, in a minimum volume of 10 %
(v/v) HCl and dilute to 100 mL with
10% (v/v) HCI; 1.00 mL = 1.00 mg Rh.
(20) Ruthenium: Dissolve 0.2052 g ruthenium
chloride, RuCI3, in a minimum volume
of 20% (v/v) HCl and dilute to 100 mL
with 20% (v/v) HCl; 1.00 mL = 1.00 mg
Ru.
(21) Silver: Dissolve 1.575 g silver nitrate,
AgN03,in water, add 1.5 mL conc.HN03,
and make up to 1000 mL; 1.00 mL = 1.00
mgAg.
(22) Sodium: Dissolve 2.542 g sodium chloride, NaCI, dried at 140°C, in water and
make up to 1000 mL; 1.00 mL = 1.00 mg
Na.
(23) Strontium: Dissolve 2.415 g strontium
nitrate, Sr(N03)2, in 1000 mL of 1%
(v/v) HN03; 1.00 mL = 1.00 mg Sr.
(24) Thallium: Dissolve 1.303 g thallium nitrate, TIN03, in water. Add 10 mL cone.
HN03 and dilute to 1000 mL with water;
1.00 mL = 1.00 mg Tl.
(25) Tin: Dissolve 1.000 g tin metal in 100 mL
cone. HCl and dilute to 1000 mL with
water; 1.00 mL = 1.00 mg Sn.
(26) Zinc: Dissolve 1.000 g zinc metal in
20 mL 1 + 1 HCl and dilute to 1000 mL
with water; 1.00 mL = 1.00 mg Zn.