Tuesday
September 30, 2014

Homework Help: chemistry

Posted by hope on Saturday, October 9, 2010 at 10:04pm.

Suppose 70.00 mL of a lithium hydroxide, LiOH, solution requires 55.42 mL of a 0.1050 M solution of propanoic acid, C2H5COOH, for neutralization.
LiOH + C2H5COOH ® C2H5COOLi + H2O

What is the concentration of the base solution?
0.08313 M
0.1663 M
0.3325 M
0.6650 M



Question 2 4.2 points Save
Balance the following net ionic equation. What is the sum of the coefficients?
MnO4- + I- + H2O I2 + MnO2 + OH-
21
23
25
27
29



Question 3 4.2 points Save
Balance the following equation. How many HCl are there on the left side of the balanced equation?
K2Cr2O7 + Na2SO3 + HCl KCl + Na2SO4 + CrCl3 + H2O
1
2
3
4
8



Question 4 4.2 points Save
What is the coefficient of NaCl in the balanced formula unit equation?
NaClO3 + H2O + I2 HIO3 + NaCl
1
2
3
4
5



Question 5 4.2 points Save
Iron(II) ions reduce dichromate ions in acidic solution to chromium(III) ions and form ferric ions. Write the balanced net ionic equation. Use H+ rather than H3O+. What is the sum of all the coefficients?
24
26
28
32
36



Question 6 4.2 points Save
What volume of 0.122 M HCl would react with 26.2 mL of 0.176 M NaOH?
37.8 mL
18.2 mL
5.56 mL
26.3 mL
75.6 mL



Question 7 4.2 points Save
What is the molarity of a K2Cr2O7 solution if 20.0 mL of the solution requires 60.4 mL of 0.200 M KI solution for complete reaction?
K2Cr2O7 + KI + H+ Cr3+ + I2 + H2O (unbalanced)
1.55 M
3.63 M
0.101 M
0.603 M
0.280 M



Question 8 4.2 points Save
A 25.0-mL sample of 0.0833 M NaClO3 reacted with 30.0 mL of an aqueous solution of I2. How many grams of I2 were contained in the I2 solution?
NaClO3 + H2O + I2 HIO3 + NaCl (unbalanced)
0.264 g
0.397 g
0.236 g
0.159 g
0.317 g



Question 9 4.2 points Save
What volume of 0.50 M KOH would be required to neutralize completely 500. mL of 0.25 M HPO solution?
2.5 ´ 10 mL
1.4 ´ 10 mL
83 mL
7.5 ´ 102 mL
5.2 ´ 102 mL



Question 10 4.2 points Save
What volume of 0.1125 M K2Cr2O7 would be required to oxidize 48.16 mL of 0.1006 M Na2SO3 in acidic solution? The products include Cr3+ and SO42- ions.
14.36 mL
28.75 mL
43.12 mL
56.12 mL
32.15 mL



Question 11 4.2 points Save
Balance the following equation. How many H+ are there in the balanced equation?
(COOH)2 + MnO4- + H+ CO2 + Mn2+ + H2O
6
2
3
4
8



Question 12 4.2 points Save
How many grams of glucose, C6H12O6, are needed to make 5.00 L of 5.00 M solution?
0.139 g
4500. g
600. g
180 g
7.2 g



Question 13 4.2 points Save
What is the molarity of a sulfurous acid solution if 23.7 mL of this H2SO3 solution requires 16.8 mL of 0.296 M NaOH for titration to the equivalence point?
0.210 M
0.358 M
0.105 M
0.421 M
0.0525 M



Question 14 4.2 points Save
How many H2O are there in the balanced equation?
CuS + NO3- + H+ Cu2+ + S + NO + H2O
one
two
three
four
five



Question 15 4.2 points Save
What is the molarity of the NaBr produced when 50.0 mL of 4.80 M NaOH is mixed with 150.0 mL of 1.60 M HBr?
2.40 M
3.20 M
1.20 M
1.33 M
480 M



Question 16 4.2 points Save
Write the balanced net ionic half-reaction for the reduction of MnO4- to Mn2+ in acidic solution. What is the sum of the coefficients (including the electrons.)
22
19
8
14
15



Question 17 4.2 points Save
What mass of molybdenum(III) oxide, Mo2O3, will be completely oxidized to potassium molybdate, K2MoO4, by 35.0 mL of 0.200 M KMnO4?
3MnO4- + 5Mo3+ + 8H2O 3Mn2+ + 5MoO42- + 16 H+
8.40 g
4.20 g
1.40 g
2.80 g
6.40 g



Question 18 4.2 points Save
What is the oxidation number of arsenic in H2AsO4-2?
+1
+2
+3
+4
+5



Question 19 4.2 points Save
What is the oxidation number of arsenic in K3AsO4?
+1
+2
+3
+4
+5



Question 20 4.2 points Save
What is the formula and molarity of the salt produced by the reaction of 17 mL of 0.33 M H2SO4 and 44 mL of 0.23 M Sr(OH)2?
SrSO4, 0.0920 M
SrSO4, 0.16 M
Sr(OH)2, 0.165 M
SrSO4, 9.2 ´ 10-5 M
SrH2, 0.0920 M



Question 21 4.2 points Save
If 35 mL of 2.0 M H2SO4 is mixed with 35 mL of 1.0 M NaOH, how many moles of H2SO4 remain after completion of the reaction?
0.070
0.035
0.0175
0.0525
zero



Question 22 4.2 points Save
What is the molarity of a phosphoric acid solution if 15.66 mL of this H3PO4 solution requires 43.81 mL of 0.2283 M NaOH for titration to the equivalence point?
1.925 M
0.1597 M
0.3193 M
0.2129 M
0.6387 M



Question 23 4.2 points Save
What is the molarity of a potassium hydroxide solution if 38.65 mL of the KOH solution is required to titrate 25.84 mL of 0.1982 M hydrochloric acid solution?
0.1325 M
0.2963 M
0.8817 M
0.2648 M
0.01324 M



Question 24 4.2 points Save
Balance the following net ionic equation. Use H+ rather than H3O+. What is the coefficient of H2O?
C + H+ + SO42- CO2 + SO2 (acidic solution)
1
2
3
4
5



Question 25 4.2 points Save
Balance the following net ionic equation. Use H+ rather than H3O+. What is the coefficient of H2S?
H2S + MnO4- SO42- + Mn2+ (acidic solution)
1
2

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry - Need help with AP chemistry, specifically Acids and Bases The acid ...
Chemistry - Lithium hydroxide is used in the space program to remove carbon ...
Chemistry - Lithium hydroxide is used in the space program to remove carbon ...
chemistry - 9). What is the balanced equation for the acid–base reaction of ...
Chemistry - Lithium hydroxide is used in the space program to remove carbon ...
Chemistry - an acid base titration is conducted in which 20 ml of LiOH is added ...
chemistry - The space shuttle environment control system handles excess CO2 (it ...
chemistry - The neutralization of 27.3 mL of an unknown concentration H2SO4 ...
chemistry - The neutralization of 27.3 mL of an unknown concentration H2SO4 ...
chemistry - The neutralization of 27.3 mL of an unknown concentration H2SO4 ...

Search
Members