Number of results: 914
How is it possible for me to tell which of these solutes will produce an acidic solution when dissolved in water? LiOH CH3CO2K H2SO3 KOH NaOH NH4NO3 NaOH NaOH can't be the only one... Molecules that produce OH^- when dissolved in water will be basic. Examples:LiOH, KOH, NaOH, ...
Thursday, May 24, 2007 at 5:02pm by Lindsay
which of the following compounds contains the lowest percentage by mass of nitrogen? 1) NH4NO3 2) (NH4)2 SO4 3) NaNO3 4) NH3 can someone please help me??what method should i use?how do i do this? Find the molar mass of each compound by adding the molar masses of every atom (...
Sunday, May 27, 2007 at 7:47am by Emma
Calculate the end point pH, when 25 mL of 0.01 mol/L HCl solution reacts exactly with 25 mL of 0.1 mol/L NH4OH solution. NH3 Kb = 1.8 x 10^-5 This will be the pH of NH4Cl solution. NH4+ + HOH ==> NH3 + H3O^+ Ka = Kw/Kb = (NH3)(H3O^+)/(NH4^+). Solve for H3O^+, then pH = - ...
Thursday, May 31, 2007 at 9:02pm by Raj
The first step of the synthesis is described by the reaction below. When 1.750 g of Fe(NH4)2(SO4)2 6H2O is mixed with 13 mL of 1.0 M H2C2O4 , the theoretical yield of FeC2O42H2O is ? grams.. I do not understand why my answer is not correct. How do you find the answer for this ...
Saturday, June 30, 2007 at 5:06am by Tiffany
Basically what color is yellow when they say "Yellow"? The titrations I have done are light yellow when approaching the end point but whatever color you see is what you get, I suppose. So titrate to a very light color. Would the extra 5ml of starch indicator have any effect on...
Wednesday, July 18, 2007 at 12:18am by DrBob222
What rationale is there for the mixing of sulfuric acid aqueous and water being exothermic but the mixing of solid ammonium chloride with water to be endothermic? Solid NH4CL dissociates in water, and the dissociation process requires some energy, because the NH4+ - Cl- ionic ...
Tuesday, July 31, 2007 at 4:25am by Vic
Using general solubility rules, write the balanced molecular equation when the following aq solutions are mixed. Underline the formula of the solid. If no precipitation reaction is likely, explain why. A. NHY4Cl, H2SO4 B. K2CO3, SnCl4 C. NH4Cl, Pb(NO3)2 D. CuSO4, KOH E.Na3PO4...
Wednesday, June 25, 2008 at 2:57pm by OliviaK
The salt contains the conjugate base or acid of the corresponding acid or base on the list. Since most buffers are combinations of a weak acid and its conjugate base, or a weak base and its conjugate acid, the combination of the salt and the related acid or base make a buffer ...
Tuesday, June 24, 2008 at 3:25pm by GK
Mg + 2HCl ==> MgCl2 +H2. The H2 will burn if enough oxygen is present or will explode if a open flame is placed near the mouth of a small test tube. A single displacement reaction. You are correct that H2O + CO2 produces H2CO3. This is a synthesis reaction. Yes, the odor is...
Thursday, September 27, 2007 at 9:58pm by DrBob222
Which of the following compounds is insouluble in water? - (NH4)2CO3 - AgBr - CuSO4 - KI - LiNO3
Wednesday, October 24, 2007 at 8:40pm by Taylor
Chemistry - Solutions
I found this and it may answer your question. water molecules pull apart the ammonium chloride lattice as a result of dipole - dipole interactions of the charged ions in the lattice in a reaction called hydration - the NH4Cl dissolves to yield [NH4]+ and [Cl]- ions NH4Cl(s...
Saturday, October 27, 2007 at 7:46pm by ~christina~
For reactions of this type, look for any ONE of three things. 1. a precipitate is formed. You will need a table of solubilities. 2. a gas is formed. You need to know which elements/compounds are gases. 3. a weak electrolyte (slightly ionized compound) is formed. You need to ...
Friday, November 2, 2007 at 6:51pm by DrBob222
What's to understand. If brackets (you used parentheses which is the usual way to do it) or parentheses, it means to multiply everything inside the parenthese by the number in the subscript. So. Mg(OH)2 has 1 Mg atom, 2 O atoms and 2 H atoms. MgO has 1 Mg atom and 1 O atom. Al...
Friday, November 2, 2007 at 9:29pm by DrBob222
A. en has 2 for a total of 4+ 2 more for each NH4. Coordination number is 6. B. You have two ligands in en and 2 more for NH3 for a total of 4. C. en is neutral. So is NH3. The charge on the complex ion is +3. So the oxidation state of Co is ???
Saturday, November 3, 2007 at 2:47am by DrBob222
A solution is prepared by dissolving 16.5 g ammonium sulfate in enough water to make 145.0 mL of stock solution. A 10.50 mL sample of this stock solution is added to 57.70 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final solution. NH4+
Saturday, November 3, 2007 at 11:32pm by mel
16.5 g (NH4)2SO4 in 145.0 mL solution = 16.5 g/145 mL = xx g/mL and use this below. Concn of diluted solution is xx g/mL x 10.50 mL/(57.70+10.50) = yy g (NH4)2SO4/mL. How is the concentration to be measured? g/mL is what the yy is above. (SO4^=) = same as (NH4)2SO4 = zz g/mL...
Saturday, November 3, 2007 at 11:32pm by DrBob222
Two main points to look for. 1. electronegativity (EN) of the atoms. 2. the shape of the molecule; i.e., is it symmetrical. Look at the EN of the two atoms. A difference in EN means that BOND is polar. If its a diatomic molecule then the MOLECULE is polar. Examples: HCl, HF, ...
Tuesday, November 6, 2007 at 11:38am by DrBob222
Hi; I'm just wondering, I need to write the dissocation equation for NH3 so that I can get Kb, and I just want to make sure that I am on the write track. I know that when some solids dissociate they just go from say CaCO3 --> CaO + CO2, but for this I'm wondering because it...
Monday, November 12, 2007 at 1:47pm by Tracy
There are compounds, such as NaNH2 (sodamide) that have the negative ion, NH2^-) but you are right on track. NH3 + HOH ==> NH4^+ + OH^- Do you want to know a little of the history of this? When I took my first chemistry course, we were taught that NH3 + HOH ==> produced ...
Monday, November 12, 2007 at 1:47pm by DrBob222
are the following true for the element gallium? if they are false make them true. oxide more basic than Al203 oxide less basic than Mg(OH)2 hydroxide soluble in acid hydroxide soluble in base sulfide precipitates with H2S sulfide not soluble in (NH4)2S will form EaCl3, Ea2S3, ...
Sunday, November 18, 2007 at 12:31pm by Amanda