Question

After the manganese (II) ion is precipitated as manganese (II) hydroxide in mixture B, the precipitate...

After the manganese (II) ion is precipitated as manganese (II) hydroxide in mixture B, the precipitate is washed with 6M NaOH(aq) solution and then with water. Why is this washing performed, and what exactly is being washed away?

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

A:- Balanced equation, Mg^2+(aq) + 2 OH^-(aq) ------>    Mg(OH)2(s)

Washing with NaOH:

                                If any unreactive Mg^2+ ions remains in the precipitate, which is completely converted to Mg(OH)2 by washing with NaOH.

Washing with water:

                              If any unreacted hydroxide ion in the mixture, which is completely dissolved in water. so by washing with water the unreactive hydroxide ions are removed.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A solution contains 1.43×10-2 M sodium hydroxide and 5.69×10-3 M potassium carbonate. Solid manganese(II) acetate is...
A solution contains 1.43×10-2 M sodium hydroxide and 5.69×10-3 M potassium carbonate. Solid manganese(II) acetate is added slowly to this mixture. A) What is the formula of the substance that precipitates first? B) What is the concentration of manganese(II) ion when this precipitation first begins?   [Mn2+] = ______ M
Tetrachlorocobalt (II) ion reacts with water to form hexaaquacobalt (II) ion according to the following net...
Tetrachlorocobalt (II) ion reacts with water to form hexaaquacobalt (II) ion according to the following net ionic equation: [CoCl4]2-(aq, blue) + 6 H2O(l) <=> [Co(H2O)6]2+(aq, pink) + 4 Cl-(aq) (A) A student doing this experiment placed a test tube containing a blue equilibrium mixture in an ice-water bath. The solution turned pink. When the student removed the test tube from the ice-water bath and placed it in the hot water bath, the solution turned blue. Is the forward reaction exothermic...
The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many...
The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 11.874 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.300 M sodium sulfate is added, a white precipitate forms. The sodium sulfate solution is added until no more precipitate forms, then a few excess milliliters are added. The precipitate is filtered, washed, and dried. It has a...
A solution contains 1.91×10-2 M calcium nitrate and 1.91×10-2 M cobalt(II) acetate. Solid sodium hydroxide is...
A solution contains 1.91×10-2 M calcium nitrate and 1.91×10-2 M cobalt(II) acetate. Solid sodium hydroxide is added slowly to this mixture. What is the concentration of cobalt(II) ion when calcium ion begins to precipitate? Solubility product constant data is found in the Chemistry References. [Co2+] = _____ M
4.A saturated solution of manganese(II) hydroxide (Mn(OH)2) was prepared, and an acid-base titration carried out to...
4.A saturated solution of manganese(II) hydroxide (Mn(OH)2) was prepared, and an acid-base titration carried out to determine its Ksp at 25oC. The endpoint was reached when 50.00 mL of Mn(OH)2 solution was titrated with 3.42 mL of 0.00100 M HCl solution. (a)Write the balanced equation for the reaction between Mn(OH)2 and HCl. (b)Write the equilibrium equation for the dissolution of Mn(OH)2 in water and then calculate the   Ksp for Mn(OH)2. (c)Calculate ΔGo for dissolution.  
Reaction 1. a) For each mole of Cu dissolved in the nitric acid solution (HNO3), how...
Reaction 1. a) For each mole of Cu dissolved in the nitric acid solution (HNO3), how many moles of [Cu(H2O)6]2+ are formed? b) Given your data above, how many moles of [Cu(H2O)6]2+ were formed in your reaction? Reaction I: Cu (s) + 4 H3O+(aq) + 2 NO3-(aq) --> [Cu(H2O)6]2+(aq) + 2 NO2(g) The first reaction in the series is an oxidation – reduction reaction where copper metal“dissolves” in nitric acid (HNO3). Anoxidation – reduction reactionoccurs when one atomgains an electron...
An unknown solution may contain some of the cations listed below. One student preformed a series...
An unknown solution may contain some of the cations listed below. One student preformed a series of experiments to determine what ions are in the solution. Based upon the experiments performed by the students, the results are as follows: a) On addition of 6 M HCl, a white precipitate results. The white precipitate is then mixed with NH3 where it dissolves. b) On the addition of 1 ml (20 drops) of 1 M thioacetamide (CH3CSNH2), the test tube was then...
An unknown solution may contain some of the cations listed below. One student preformed a series...
An unknown solution may contain some of the cations listed below. One student preformed a series of experiments to determine what ions are in the solution. Based upon the experiments performed by the students, the results are as follows: a) On addition of 6 M HCl, a white precipitate results. The white precipitate is then mixed with NH3 where it dissolves. b) On the addition of 1 ml (20 drops) of 1 M thioacetamide (CH3CSNH2), the test tube was then...
Q. When a pink aqueous solution of potassium permanganate, faintly acidified with dilute sulfuric acid was...
Q. When a pink aqueous solution of potassium permanganate, faintly acidified with dilute sulfuric acid was treated with 10% aq. hydrogen peroxide, the reaction took place with the evolution of gas bubbles, and the pink solution was turned colorless. Further chemical analysis revealed that the evolved gas was oxygen, and the resulting solution contains potassium sulfate and manganese (II) sulfate; water was also formed during the same reaction. Please answer the followings: 1) Write down the balanced chemical equation for...
In aqueous solution cobalt(II) ion is surrounded by 4 water molecules and has a light pink...
In aqueous solution cobalt(II) ion is surrounded by 4 water molecules and has a light pink color. When high concentrations of chloride ion are introduced, a cobalt-chloride complex ion forms that has a distinctive blue color. One way to represent this equilibrium is: ... CoCl42-(aq) Co2+(aq) + 4 Cl -(aq) ... An experiment was run to demonstrate that a dynamic equilibrium exists between these two ions. Starting with a special form of CoCl42-(aq) where one of the chloride ions was...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT