# A 5.000g sample of a dry mixture of potassium hydroxide, potassium carboate and potassium chloride is reacted with 0.100 L of 2.00-molar HCl solution. A 249.0 mL sample of dry carbon dioxide gas, measured at 22.0 degree Celsius and 740.0

21,861 results
1. ## Chemistry

A 0.8870-g mixture of sodium chloride and potassium chloride is dissolved in water and silver nitrate is added. The AgCl that precipitates has a mass of 1.913 g. Calculate the percent by mass of potassium in the initial mixture。

2. ## chemistry

What volume of a 0.550 M solution of potassium hydroxide can be made with 14.3 g of potassium hydroxide? (Ignore significant figures for this problem.)

3. ## chemistry Molarity

You have 353 mL of a 1.25 M potassium Chloride solution, but you need to make a 0.50 M potassium Chloride solution. How many milliliters of water must you add to the original 1.25 M solution to make the 0.50 M potassium Chloride solution

4. ## Chemistry

If the density of ocean water at a depth of 1.00 x 104 m is 1.071 g/mL and if 20.0 g of water at that depth contains 197mg of potassium chloride, what is the molarity of potassium chloride in the sample? It wants it in M.

5. ## Chemistry

Which of the following aqueous solutions are good buffer systems ? . 0.26 M hydrochloric acid + 0.24 M potassium chloride . 0.14 M acetic acid + 0.20 M potassium acetate . 0.16 M potassium hypochlorite + 0.23 M hypochlorous acid . 0.31 M hydrocyanic acid +

6. ## Chemistry

The potassium salt of benzoic acid, potassium benzoate, KC7H5O2, can be made by the action of potassium permanganate on toluene, C7H8. C7H8 + 2 KMnO4 --> 2MnO2 + KOH + H2O If the yield of potassium benzoate cannot be realistically be expected to be more

7. ## chemistry

A 2.118 g sample of a solid mixture containing only potassium carbonate ( MM=138.2058 g/mol ) and potassium bicarbonate ( MM=100.1154 g/mol ) is dissolved in distilled water. A volume of 30.20 mL of a 0.763 M HCl standard solution is required to titrate

8. ## chemistry

3.0g of a mixture of potassium carbonate and potassium chloride were dissolved in a 250cm3 standard flask. 25cm3 of this solution required 40.00cm3 of 0.01M HCl for neutralization. What is the percentage by weight of K2CO3 in the mixture? (K = 39, O = 16,

9. ## Chemistry

A 10.00 gram solid sample consisting of a mixture of sodium chloride and potassium sulfate is dissolved in 100.0 mL of water is combined with another 200.0 mL solution that contains excess aqueous lead(II) nitrate. Upon mixing the two solutions, a solid

10. ## Chemistry

when 2 moles of potassium chlorate crystals decompose to potassium chloride crystals and oxygen gas at a constant pressure and temperature, 78.0 kj of heat is given off. write a thermodynamic equation for this reaction.I don't know how to set up the

11. ## Ap Chemistry

a mixture contains only sodium chloride and potassium chloride. a .1586-g sample of the mixture was dissolved in water. it took 22.90 mL of 0.1000 M AgNO3 to completely precipitate all the chloride present. what is the composition(by Mass percent) of the

12. ## Chem

18) Chlorine reacts with potassium bromide to produce potassium chloride and bromine. A) write a chemical equation, using words, to represent the above chemical reaction. My answer: chlorine + potassium bromide ==> potassium chloride and bromine ( I'm

13. ## chemistry

write a net ionic equation for the following: 1)Iron (III) chloride reacts with Potassium hydroxide to produce Iron (III) oxide, Potassium chloride, and Hydrogen gas. 2)Hydrochloric acid reacts with Potassium carbonate to produce Potassium chloride,

14. ## chemistry

Which of the following statements best describes p orbitals? a dumbbell with a ring around it a sphere around the nucleus a four-leave clover two lobes apposing each other Examine the three isotopes of potassium (K) below. potassium-41, potassium-39,

15. ## chemistry

35.8g of a mixture of potassium chloride and potassium trioxochlorate(v), we're heated to a constant mass. If the residue weighs 24.9g.what was the percentage mass of the potassium chloride in the mixture (k=39, cl=35.5, o=16)

16. ## Chemestry

A 5.000g sample of a dry mixture of potassium hydroxide, potassium carboate and potassium chloride is reacted with 0.100 L of 2.00-molar HCl solution. A 249.0 mL sample of dry carbon dioxide gas, measured at 22.0 degree Celsius and 740.0 torr, is obtained

17. ## chemistry

35.8g of a mixture of potassium chloride and potassium trioxochlorate (v), were heated to a constant mass. if the residue weighed 24.9g, what was the percentage mass of the potassium chloride in the mixture? (k=39, cl=35.5, o=16) kcl is not decomposed on

18. ## Chemistry2

12.) Chlorine reacts with potassium bromide to produce potassium chloride and bromine. a.) write a chemical equation, using words, to represent the above chemical reaction. Answer: Chlorine + potassium bromide ==> potassium chloride + bromine (Is this

19. ## Chemistry

Been stumped on this problem for a day now. 2KClO3-->2KCl+3O2 a) If 53.0g of potassium chlorate breaks down, what volume of oxygen is produced? For this one I got: 14.6L O2 b) How many grams of potassium chloride are produced from problem a? For the life

20. ## Chemistry

39.8g of a mixture of Potassium chloride, KCl, and Potassium trioxochlorate (v) KClO3, were heated to a constant mass.If the residue weighed 28.9g, what was the percentage of Potassium chloride in the mixture? (O=16,Cl=35.5,K=39)

21. ## Chemistry

39.8g of a mixture of potassium chloride, KCl, and potassium trioxochlorate(V), KClO3, were heated to a constant mass. If the residue weighed 28.9g, what was the percentage mass of the potassium chloride in the mixture? ( K = 39, Cl = 35.5, O = 16) HINT:

22. ## chemistry

What mass of potassium chloride, a salt substitute often used by heart patients, can be produced directly from 5.2 g potassium and 7.9 g chlorine? 9.9 g

23. ## math

You're asked to add 15 mEq of potassium chloride per 100 mL of Normosol. Potassium chloride is available as 20 mEq/ 10mls. The amount of Potassium chloride needed for a 3 L bag of Normosol would be ?

24. ## Chemistry

20.When black gunpowder explodes, potassium nitrate, carbon, and sulfur react with each other to form nitrogen, carbon dioxide, and potassium sulfide. If thee original mixture contains 50.0 g of potassium nitrate, what is the total volume of the gases

25. ## Chemistry

Writing the net ionic equation for sodium fluoride+hydrochloride, magnesium iodide + lead (II) acetate sliver (I) acetate + potassium iodide nickel (II) sulfate + barium chloride barium acetate + ammonium sulfate barium hydroxide +aluminum bromide zinc

26. ## Science

to create a 0.25 M Potassium Chloride solution. Your mass is 5.00 grams of Potassium Chloride. How many liters of water is needed?

27. ## Chemistry

An aqueous solution of potassium hydroxide is mixed with an (aq) of magnesium chloride and you get a clumpy white precipitate that forms. Write a complete and balanced equation to calculate the stoichiometry question: how many grams of the precipitate are

28. ## Gen Chem

What are the net ionic equations for: 1. Potassium Fluoride and Ammonium Chloride and 2. Sodium Hydrogen Sulfite and Potassium Cyanide?

29. ## CHEM

Which reactants could be used safely to prepare potassium chloride? 1. aqueous potassium hydroxide and dilute hydrochloric acid 2. aqueous potassium sulphate and aqueous sodium chloride 3. potassium and aqueous sodium chloride The answer is 1, but i don't

30. ## chemistry

write ionic equation for : potassium carbonate and sodium sulfate sulfuric acid and strontium chloride potassium phosphate and sodium hydroxide sodium hydroxide and strontium chloride

31. ## chemistry

What volume of a 0.550 M solution of potassium hydroxide can be made with 18.3 g of potassium hydroxide? (Ignore significant figures for this problem.)

32. ## Chemistry

Potassium superoxide, KO2, is used for producing oxygen and removing carbon dioxide in selfcontained breathing units, space shuttles, and other enclosed spaces. First the potassium superoxide reacts with moisture to release oxygen and produce potassium

33. ## chemistry

how would you make one gram potassium chloride with barium chloride and potassium carbonate

34. ## Chemistry

Potassium chlorate, KCIO3, acts as an oxidizing agent in matches, explosives, flares, and fireworks. In the equation below, it is formed from the element chlorine and potassium hydroxide. 3 Cl2+ 6KOH=KCIO3+5KCL+3H2O Write a conversion factor that could be

35. ## Chemistry

A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this

36. ## general chemistry

I need the oxidation half reactions, reduction half reactions, and net ionic equations for the following reactions: 1)magnesium +0.1M zinc sulfate 2)copper+0.1M zinc sulfate 3)zinc+0.1M copper(II)sulfate 4)zinc+3M HCl 5)copper+3M HCl 6)0.1M potassium

37. ## Chemistery

Writing the net ionic equation for sodium fluoride+hydrochloride, magnesium iodide + lead (II) acetate sliver (I) acetate + potassium iodide nickel (II) sulfate + barium chloride barium acetate + ammonium sulfate barium hydroxide +aluminum bromide zinc

38. ## CHEM

I posted a question earlier, and i'm still abit confused. What is the reaction between potassium and aqueous sodium chloride? I was told that the products are KOH, H2, and KCl. But shouldn't the reaction be a displacement reaction? Since Potassium is more

39. ## Chemistry

Potassium superoxide, KO2, is used for producing oxygen and removing carbon dioxide in selfcontained breathing units, space shuttles, and other enclosed spaces. First the potassium superoxide reacts with moisture to release oxygen and produce potassium

40. ## Chemistry

a student was asked to determine the components of a mixture of potassium bromide (KBr), magnesium hydroxide, Mg(OH)2, and barium sulfate (BaSO4). The mass of the sample of the mixture used was 3.21 g

41. ## Chemistry

How many potassium ions are present in the following: 1) 3 moles of potassium chloride.

42. ## chemistry

When potassium chlorate is heated, it decomposes into potassium chloride and oxygen in the reaction 2KCIO3 -> 2KCI + 3O2. How much oxygen is liberated when 50 g of potassium chlorate is heated?

43. ## chemistry

A 5.000 gram sanple of dry mixture of potassium hydroxide, potassium carbonate and potassium chloride is reacted with 0.100L of 22.0 degrees Celsius and 740.0 torr,is obtained from this reaction. What was the percentage of potassium carbonate in the

44. ## Chemistry

8.4 g of a mixture of potassium hydroxide and potassium chloride were made up of 1 litre of aqueous solution. 20 cm of this solution required 24.2 cm of 0.1 m nitric acid for neutralisation. calculate the percentage by mass of potassium chloride in the

45. ## chemistry help!

Potassium has an atomic mass of 39.10amu. a sample of potassium is made up of isotopes potassium-39 (mass=38.964) and potassium-41(mass =40.962 amu). What percentage of the potassium sample is potassium-39? what percent of the sample is potassium-41?

46. ## chemistry

Which one of the following will have the greatest number of moles of potassium ion: 10.0 mL of .10 M potassium hydroxide, 30.0 mL of 0.15 M potassium carbonate, or 25.0 mL of 0.080 M potassium phosphate

47. ## Chemistry

Need Help On This Question.! Potassium chloride reacts with bromine forming potassium bromide plus chlorine. If 500g of potassium bromide are produced, how many grams of potassium chloride reacted?

48. ## chemistry

a mixture of 39.8g containing potassium chloride and potassium trioxochlorate (v) upon heating, the residue weighed 28.7g what is the percentage mass of potassium chloride in the residue?

49. ## chem

A 0.774 g mixture containing only sodium chloride and potassium chloride was dissolved in water. It required 29.6 mL of 0.416 M AgNO3 to completely precipitate all of the chloride present. What is percent composition by mass of sodium chloride and

50. ## CHEMISTRY

Write the net ionic equation for the reaction between...(and MUST INCLUDE STATES, please post answers to all so i can verify if im correct and explanation to one of them) a) potassium hydroxide and copper(I) nitrate b) potassium sulfite and lead(II)

51. ## Chemistry

Potassium oxide reacts with water to produce of potassium hydroxide. Please provide a balanced equation, and determine how much potassium oxide is needed to produce 80.5g of potassium hydroxide?

52. ## Chemistry

What colors would you expect to see in a flame for the following compounds: potassium chloride, potassium nitrate, and potassium sulfate. Explain your answer

53. ## chemistry

3.0g of a mixture of potassium carbonate and potassium chloride were dissolve in a 250cm standard flask. 25cm of this solution required 40.00cm of 0.01mole HCl for neutralization what is the percentage by weight of K2Co3 in the mixture?

54. ## chemistry

35.8 of a mixture of potassium trioxochlorate (v) were heated to a constant mass. if the residual weighed 24.5 what was the percentage mass of the potassium chloride in the mixture (k=39 (l= 3,5,6=16)kcl is not decomposed on heating solve the calculation

55. ## Chemistry

A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this

56. ## Chemistry

A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this

57. ## chemistry

@DrBob222 I am stuck, x=1.590 g of k2CO3=> x+y=2.118 1.590+y=2.118 => y=0.528 g of KHCO3 then 0.528 g to moles 2x+0.00527 mole=0.0230 mol => x=1.225 g of KCO3 A 2.118 g sample of a solid mixture containing only potassium carbonate ( MM=138.2058 g/mol ) and

58. ## Chemistry

when potassium in water are combined they produced 4000.0 kJ of heat along with potassium hydroxide and hydrogen gas. how much energy would be produced if you dumped a 1.00 kg chunk of potassium into a swimming pool? s this reaction what is the enthalpy

59. ## Chemistry

A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this

60. ## Chemistry

In a coffee cup calorimeter, 2.00 g of potassium hydroxide are mixed with 200.0 g of water at an initial temperature of 25.00C. After dissolving the salt, the final temperature of the solution is 27.33C. What is the heat change for the dissolution of

61. ## Chemistry

An original samplemof an unknown potassium chloride/potassium cholate mixture weighed 1.042g before heating and 0.943g after heating. How many grams of oxygen were released?

62. ## chemistry

Potassium nitrate is made by adding potassium chloride to hydrogen nitrate in the presence of oxygen gas. Along with the potassium nitrate, chlorine and water are produced. How would write the equation?

63. ## Chemistry- Drbob-help

I have placed the answer I got please help. A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 870mL

64. ## Chemistry

What is the thermal stability of potassium phosphate and why? Thanks. I assume you mean as a powder, not as an water solution. Potassium phosphate is deliquescent. At elevated temperatures, phosphorus oxides are released as the compound decomposes. How

65. ## Chemistry

Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. If 50.0 mL of hydrogen gas is produced at STP, what is the mass of potassium that reacted? 2K(s) + 2 H2O (l) -> 2 KOH (aq) + H2(g)

66. ## chemistry

23.8 ml of a 2.0 mol/l surfuric acid solution reacted completely with 68.0 ml of potassium hydroxide. find the concentration of potassium hydroxide

67. ## chemistry

23.8 ml of a 2.0 mol/l surfuric acid solution reacted completely with 68.0 ml of potassium hydroxide. find the concentration of potassium hydroxide

68. ## chemistry

A 0.4272-g sample of a potassium hydroxide – lithium hydroxide mixture requires 26.94mL of 0.3385M for its titration to the equivalence point. What is the mass percent lithium hydroxide in this mixture?

69. ## chemistry

A 0.4272-g sample of a potassium hydroxide – lithium hydroxide mixture requires 26.94mL of 0.3385M for its titration to the equivalence point. What is the mass percent lithium hydroxide in this mixture?

70. ## chemistry

0.4324 g sample of a potassium hydroxide-lithium hydroxide mixture requires 28.28 ml of 0.3520 M HCl for its titration to the equivalence point. What is the mass percent lithium hydroxide in this mixture?

71. ## chemistry

15.45 grams of solid potassium chlorate decomposes when heated to form potassium chloride and oxygen gas. assuming 100% yeild how many grams of solid potassium will be produced?

72. ## chemistry

24ml of .05 mol per litre of SILVRE NITRATE reacts with 15 ml of potassium chloride.calculate molar concentration of potassium chloride.

73. ## chemistry

24ml of .05 mol per litre of SILVRE NITRATE reacts with 15 ml of potassium chloride.calculate molar concentration of potassium chloride.

74. ## chemistry

Potash is composed mainly of potassium carbonate, K2CO3. If 1.000g of potash reacts with sulfuric acid to produce 145 mL of carbon dioxide gas at STP, what is the percentage of potassium carbonate in the marble sample? K2CO3 + H2SO4 ==> K2SO4 + H2O + CO2

75. ## Chemistry

1. What amount of Potassium Chloride forms when 5.25 litres of Chloride gas at 0.95 atm and 293K reacts with 17.0g of Potassium.

76. ## Chemistry

A 500 mL potassium chloride solution was prepared by dissolving potassium chloride in distilled water. 25.0 mL of the solution was titrated with 0.300 M silver nitrate solution. 28.90 mL of silver nitrate solution was required to reach the end point in the

77. ## Chemistry

If the density of ocean water at a depth of 1.00 x 10^4 m is 1.071 g/mL and if 27.0 g of water at that depth contains 197 mg of potassium chloride, what is the molarity of potassium chloride in the sample?

78. ## chemistry

I have two solutions of 0.1 Molar. A solution of magnesium chloride and a solution of potassium chloride. I thought that the 0.1 M solution of magnesium chloride would conduct electricity better than a 0.1 M solution of potassium chloride. I did a lab in

79. ## Chemistry

Describe how you could make 5 mL of 2M potassium hydroxide solution if you have potassium hydroxide pellets available.

80. ## chemistry

what would be observed when combining an aqueous mixture of: potassium carbonate and hydrochloric acid, zinc chloride and silver nitrate, magnesium chloride and sodium hydroxide, ammonium nitrate and sodium hydroxide?

81. ## chemistry

Write Sulfuric acid and potassium hydroxide where the products are potassium sulfate and water.

82. ## chemistry

If 5.6 grams of potassium hydroxide is added to enough water to make 950 ml of solution, what is the concentration of the potassium?

83. ## Chemistry- Drbob-help#3

I still need help with #3 I'm not sure how I got 1.14M. I have tried to do the problem over, but I not coming up with my original answer of 1.14M. Somehow I am missing a step. Please show work for the 1.14M Thanks Question#9 reads exactly as written. A

84. ## chem

name the following binary acids. is the name for K2S, potassium sulphide or potassium sulfide? and is the name for K2Te, potassium telluride?

85. ## chemistry ........................chemistry

Sodium Na+ Intense yellow Barium Ba++ Green Calcium Ca++ Brick red Copper Cu+ or Cu++ Blue-green Strontium Sr++ ? Lithium Li+ ? Sodium and potassium mixture Na+&K :yellow light Observations using the cobalt glass filter Sodium & potassium mixture

86. ## college

Please explain with complete step by step instructions. #8)One type of lawn fertilizer consists of a mixture of nitrogen, phosphorus and potassium. An 80lb sample contains 8 move lbs of nitrogen and phosphorus than potassium. There is 16lb more potasssium

87. ## college Algebra

Please explain with complete step by step instructions. #8)One type of lawn fertilizer consists of a mixture of nitrogen, phosphorus and potassium. An 80lb sample contains 8 move lbs of nitrogen and phosphorus than potassium. There is 16lb more potasssium

88. ## chemistry

how would you make one gram potassium chloride with barium chloride and potassium carbonate

89. ## Science

potassium metal reacts with water to give potassium hydroxide and hydrogen gas How to balance this equation with proper steps?

90. ## CP Biology

At what temperate are potassium nitrate and potassium chloride equally soluble?

91. ## Chemistry

For which of following can the metal ions be separated from one another by adding solution of sodium hydroxide? (a) cobalt nitrate and aluminum nitrate (b) barium nitrate and potassium chloride (c) magnesium nitrate and nickel nitrate (d) potassium nitrate

92. ## physiology

the blood-brain barrier prevents hydrophobic molecules from diffusing into the brain. T or F Excitable cells are incapable of maintaining a constant resting membrane potential. T or F The membrane of resting nerve cells is more permeable to______ions than

93. ## Chemistry

How many total miles of ions are released when the following sample dissolves completely in water? 9.99 X 10^20 formula units of FeCl3 = How many grams of solute are needed to make 379 mL of 6.34 X 10^-2 M potassium sulfate? Calculate the molarity of a

94. ## Chemistry

A compound contains only potassium and iodine. A sample weighing 12.3 g of this compound contained 2.90 g of potassium. How many grams of iodine would there be in another sample of this compound containing 9.56 g of potassium? Do I find the mol of each

95. ## Chemistry

The decomposition of potassium chlorite yields oxygen gas and potassium chloride. If the yield is 95%, how many grams of KClO3 are needed to produce10.0 L of O2?

96. ## chem

how many grams of potassium chlorate decomposes to potassium chloride and 638 mL pf o2 at 128°C and 752 torr? 2KClO3(s) 2KCl(s) + 3O2(g)

97. ## Chemistry

A given solution contained potassium chloride, KCl, and hydrochloric acid. 25 cm3 of it needed 24.80 cm3 of 0.0986 M sodium hydroxide solution to neutralize the acid, and the neutral solution then required 23.55 cm3 of 0.2 M silver nitrate, AgNO3, solution

98. ## chemistry

. How many grams of potassium chloride, KCl, are needed to prepare 0.630 L of a 2.50 M solution of potassium chloride? (4.0 points) (Points :4) 1.575 M 117 g 2.54 m 23.19 g

99. ## chemistry

Is it true that more potassium bromide can dissolve in distilled water than in a solution of potassium chloride? Im thinking maybe the common ion effect is present here?

100. ## Chemistry

PLease help how many grams of potassium chlorate decomposes to potassium chloride and 638 mL of O2 at 128°C and 752 torr? the formula given: 2KClO3(s) 2KCl(s) + 3O2(g)