General Chemistry Answers

On the laboratory shelf are 250mM solutions of both Acetic Acid and Sodium Hydroxide. How would you make a 100 ml solution of 25mM Acetate buffer of pH 5.50 using these stock solutions?

1. B is a solution containing 5.30g of anhydrous sodium trioxocarbornate(IV) per DM³ . A solution of hydrochloric acid of unknown concentration put solution A into the burette and titrate 25cm³ portion of B with A using methyl orange as the indicator record the volume of your pipette.

Calculate the average volume of acid used from your results,calculate

(a) the concentration of solution B in mol DM³

(b) the concentration of solution A in mol DM³

(c) in solution A the equation of reaction is 2HCl + na2co3 > 2nacl+co2+h20

1.  B is a solution containing 5.30g of anhydrous sodium trioxocarbonate(iv) per dm³ . A is a solution of hydrochloric acid known concentration. Put a solution A into the burette and titrate 25cm³ (or 20cm³) portion of B with A using methyl orange as indicator. Record the volume of your pipette.  (Tabulate your burette readings and calculate the average volume of acid used from your results.)

CACULATE:

(A)   The concentration of solution B in moles per dm³

(B)  The concentration of solution A in moles per dm³

(C)  The mass concentration in g per dm³ of the acid in solution A THE EQUATION OF REACTION IS = 2HCl + NaCo₃     -------->       2NaCl + Co₃ + H₂O

(H=1, C=12, O=16, Na=23, Cl=35.5

Burette Reading Rough Titre 1^st titre 2^nd titre

(cm3) (cm3) (cm3)

Finial 24. 55 48.85 24.30

Initial 0.10 24.55 0.00

Vol of acid used ? ? ?

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Give the name and formulae of any two compounds each contain 3 of the elements in carbon oxygen neon sodium magnesium aluminum sulphur chlorine and argon

What are the different factors affective the solubility of the solution? Give examples each.

What is the mass fraction and volume fraction of an aqueous solution having 0.7304 Mol Fraction, 0.6268 Specific Gravity of solute and 42.00 Molar Weight of solute?

Group II cations are differentiated from group III cations by the solubilities of their precipitate in HCl acid.  which is true?

a. Group II is soluble

b. Group III is soluble

c. Both are soluble

d. Both are insoluble

When a gas is bubbled through water at 298K a very dilute solution of the gas is obtained. Henry's law of constant for the gas at 298K is 150K bar. If the gas excerts a partial pressure of 2 bar the no. Of millimoles of the gas dissolved in 1L of water is