soft Word- Aods x seo Marshall/Downloads/Aads%20Bases%20Salts%2 La0%20Assignment

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soft Word- Aods x seo Marshall/Downloads/Aads%20Bases%20Salts%2 La0%20Assignment%20(2).pdf d Buffers Pre-Lab Assignment docx The remaining work must alse go in your notebook. 10. Suppose you took 0.400 grams of aluminum nitrate nonahydrate and dissolved it in a 100-ml volumetric flask. a. What is the molarity of A'? Show your work! b. Write out an equilibrium reaction for Al(HO) in water. (See text) c Do you expect this solution to be acidik, basic or neutra? SOLUTIONS OF SALTS AND ACIDS/BASES 11. Suppose 1.30 g of NaNO, is added to enough 0.20 M HNO, to make exacty 50 ml of solution. What is the expected pH of the resulting solution? SHOW WORK. The Preparation of a Buffer

Explanation / Answer

Ans 10

A)

aluminium nitrate Nona hydrate = Al(NO3)3·9H2O

Molecular weight of Al(NO3)3·9H2O = 375.129 g/mol

Moles of Al(NO3)3·9H2O = mass/molecular weight

= 0.400g / 375.129 g/mol

= 0.0010663 mol

Volume = 100 mL = 0.100 L

Molarity of Al3+ = 0.0010663 mol / 0.100 L

= 0.010663 M

B) equilibrium reaction

[Al(H2O)6]3+ + H2O = [Al(H2O)5OH]2+ + H3O+

C)

It gives off H3O+, therefore the solution is basic

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