List 2 everyday situations in which it would be useful to identify unknown substances.

1 answer:

7 0

TESTS USED-
Spectroscopic method is used to determine unknown substances found in wildlife waters.

IMPORTANCE-
To control the quality of fish.

TESTS USED -
Blood or urine tests are used for analysis
Gas chromatography is the most common method of chemical analysis

IMPORTANCE -
to avoid cheating in sports

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What is the molarity of a 2.4-liter solution containing 124 grams of HF?

ioda

Molar mass:

HF = 1 + 19 = 20.0 g/mol

Number of moles :

124 / 20.0 => 6.2 moles

Volume = 2.4 L

M = n / V

M = 6.2 / 2.4

M = 2.6 M

Answer A

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A chemistry student weighs out of hypochlorous acid into a volumetric flask and dilutes to the mark with distilled water. He pla

riadik2000 [5.3K]

Answer:

Volume of NaOH, aka V2 = 6.32 mL to 3 sig. fig.

A chemistry student weighs out 0.0941 g of hypochlorous acid (HClo) into a 250. ml. volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.2000 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Round your answer to 3 significant digits mL.

Explanation:

1 mole HClO = 74.44g

0.0941g = $\frac{0.0941}{74.44}$ = 0.00126 moles

Concentration = no. of moles/volume in L

Hence, Concentration of HClO = 0.00126/ 0.250L

= 0.005M.

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0.005 × 250 mL = 0.2 × V2

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dolphi86 [110]

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A chemical change can be seen in how the molecular formulas of the products are different from the reactants, since the reactants have chemically changed into completely different molecules.

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Answer:

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