#1. Show work

Consider a new alloy that is made by mixing the following three metals in the given proportions, by

mass: 55.75% aluminum; 33.50% lead; 10.75% magnesium

The new alloy is sold as cubes with a total mass of 22.75 g. Calculate the density of a

single cube of this alloy. (Hint: Assume that the volumes of the metals are additive

and assume that the temperature of all the metal samples and the alloy remains

constant. You will need to look up the density of each of the pure metals)

Can you please write a written detailed procedure (like paragraph not a chart please) for the two experiments:

1- qualitative analysis of cation group 1

2- qualitative analysis of cation group 2

125.0-mL aliquot of 0.124 M diprotic acid H2A (pK1 = 4.03, pK2 = 8.06) was titrated with 1.24 M NaOH. Find the pH at the following volumes of base added: Vb = 0.00, 1.80, 6.25, 11.50, 12.50, 13.50, 18.75, 24.00, 25.00, and 28.00 mL. (Assume Kw = 1.01 ✕ 10−14.)

A 0.400 M solution of weak base has a pH of 9.85. What is the base hydrolysis constant, Kb for the weak base?

What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL 21) of aqueous formic acid requires 29.80 mL of 0.0567 M NaOH? Ka =1.8 × 10-4 for formic acid.

A) 2.46 B) 8.12 C) 11.54 D) 5.88

A student started a synthesis of alum with 3.4x10^-2 mole aluminum:

2Al (s) + 6h2O (I) + 2KOH (aq)------> 2K[Al(OH)4] (aq) + 3H2 (g) (1)

2K[Al(OH)4] (aq) + H2SO4 (aq) ------> 2Al(OH)3 (s) +2 K2SO4 (aq) + 2H2O (I) (2)

2Al(OH)3 (s) + 3H2SO4 (aq) ---------> Al2(SO4)3 (aq) + 6H2O (3)

Al2(SO4)3 (aq) + K2SO4 (aq) + 24 H2O---------> 2KAl(SO4)2 12H2O (4)

a) What theoretical yield of alum, in gram, would be produced from 3.4x10^-2 mole of aluminum?

b) A student obtained 12.4 g alum from the synthesis. If the theortical yield was 19.6 g, what was the percent yield?

Why does the Zaitsev product always form in an E1 reaction regardless of the bulkiness of the base?

A 110.0-mL aliquot of 0.120 M weak base B (pKb = 4.55) was titrated with 1.20 M HClO4. Find the pH at the following volumes of acid added: Va = 0.00, 1.30, 5.50, 10.00, 10.90, 11.00, 11.10, and 14.00 mL. (Assume Kw = 1.01 ✕ 10−14.)

The dibasic compound B (pK_b1 = 4.03, pK_b2 = 8.06) was titrated with 1.12 M HCl. The initial solution of B was 0.112 M and had a volume of 100.0 mL. Find the pH at the following volumes of acid added: V_a = 0.00, 2.00, 5.00, 9.00, 10.00, 11.00, 15.00, 19.00,20.00, and 22.00 mL. (Assume K_w = 1.01 ✕ 10⁻¹⁴.)

Consider N₂O₄ (g) ---> 2 NO₂ (g) . 3.00 X 10^-2 mol of N₂O₄ are placed in a 1.0 L flask. AT equilibrium, 2.36 X 10^-2 mol of N₂O₄ remain. What is the Keq for this reaction?

A 23.7 mL sample of 0.355 M ammonia, NH3, is titrated with 0.329 M hydrochloric acid. At the equivalence point, the pH is .

Description: In week 1 we discussed which amino acids were termed “essential” but we lacked the knowledge to really understand why these would be difficult to make. Now that we have examined the process of making amino acids, let's take a second look at why the body doesn’t make certain amino acids.

Instructions: Write a response to the following prompt and then review your peers response:

Prompt: Propose a reason for why so many of the essential amino acids belong in the aliphatic and aromatic groups.

how does the rotameter (flow meter) measure volumetric flow rate of air in the system?explain using a digram and 2-3 sentence discussion of the forces acting on the rotameter ball.

KBr crystallizes in a NaCl (B1) structure with a lattice constant of a=0.65966nm.
Determine the bulk density of KBr and the distance between a K ion and a touching Br
ion in the structure. Rationalize your result with the sum of ionic radii for K and Br

A solution is prepared by dissolving 15.0 g of pure HC2H3O2 and 25.0 g of NaC2H3O2 in 775 mL of solution (the final volume). (a) What is the pH of the solution? (b) What would the pH of the solution be if 25.0 mL of 0.250 M NaOH were added? (c) What would the pH be if 25.0 mL of 0.40 M HCl were added to the original 775 mL of buffer solution?