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Mumz [18]
3 years ago
5

Mn or Co is treated with 1 mL of 6 M HNO3 followed immediately by the drop-wise addition of 3% hydrogen peroxide until the preci

pitate fully dissolves. The test tube is then heated in a water bath until bubbling ceases. At this stage of the experiment, which elements could be found in the resulting LIQUID?
Chemistry
1 answer:
ki77a [65]3 years ago
3 0

Answer:

Mn, Co,  H, N and O

Explanation:

When metallic Mn or Co reacts with concentrated HNO₃, they dissolve completely in the acid . The products formed are the nitrates of the metals, water and a mixture of NO and NO₂ gases. Hydrogen peroxide is added to oxidize any NO to NO₂ which is less harmful.

The equations of the reaction are given below;

Mn + HNO₃ ====> Mn(NO₃)₂ + NO + H₂O

Co + HNO₃ ====> Co(NO₃)₂ + NO + H₂O

H₂O₂ + NO ====> H₂O + NO₂

The resulting solution will be the soluble nitrates of manganese and cobalt as well water and this solution contains the following elements; Mn, Co, N, H And O.

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20 mL of an approximately 10% aqueous solution of ethylamine, CH3CH2NH2, is titrated with 0.3000 M aqueous HCl. Which indicator
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Answer:

Therefore, The indicator that is best fit for the given titration is Bromocresol Green Color change from pH between 4.0 to 5.6

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Explanation:

The equation for the reaction is :

C_2H_5NH_2_(_a_q_)     +     H^+_(_a_q_)   ---      C_2H_5NH_{3(aq)}^+

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= 0.222 mol

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= 2.22 M

number of moles of C_2H_5NH_{2(aq) in 20 mL can be determined as:

= 20 mL \times  2.22 M= 44*10^{-3} mole

Concentration of C_2H_5NH_2(aq) = \frac{44*10^{-3}*1000}{20}

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Similarly, The pKa Value of C_2H_5NH_{2(aq) is given as 10.75

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= 14 - 10.75

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the pH value at equivalence point is,

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pH = 5.21

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1.73 is the answer

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