Chemistry

When 1914.8C of electricity was passed through two electrolytic cells connected in series 0.6g of a metal M1 was deposited in one of the electrolyte, if 2.14g of another metal M2 was deposited at the other cathode and the sum of the quantity required to deposit 1mole of M1 and 1 mole of M2 is 289500C. Determine the charges on the ions of M1 and M2.

  1. 👍 0
  2. 👎 0
  3. 👁 240
  1. 50.0 mL of a 0.200 M solution of the weak base N-ethylmorpholine (C6H13NO) is mixed with 8.00 mL of 1.00 M HCl and then diluted to a final volume of 100.0 mL with water, the result is a buffer with a pH of 7.00. Compute the Kb of N-ethylmorpholine.

    1. 👍 0
    2. 👎 0
  2. mmols weak base = 50.0 x 0.200 = 10
    mmols HCl = 8.00 x 1.00 = 8
    salt formed (the acid) = 8 mmols and concn = mmols/mL volume total.
    weak base remaining = 2 mmols and concn = mmols/total volume
    pH = pKa + log (base/acid). Substitute, solve for pKa, then
    pKa + pK = pKw = 14 and solve for pKb and convert to Kb.

    1. 👍 0
    2. 👎 0
  3. Note the typo in pKb.
    mmols weak base = 50.0 x 0.200 = 10
    mmols HCl = 8.00 x 1.00 = 8
    salt formed (the acid) = 8 mmols and concn = mmols/mL volume total.
    weak base remaining = 2 mmols and concn = mmols/total volume
    pH = pKa + log (base/acid). Substitute, solve for pKa, then
    pKa + pKb = pKw = 14 and solve for pKb and convert to Kb.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics -conceptual

    A 1 mF, a 2 mF, and a 3 mF capacitor are connected in series, the combination being connected across a 9 volt battery. Which capacitor has the greatest voltage?

    asked by Liz on February 3, 2013
  2. Physics

    A battery of three cells in series each of emf 2v and internal 0.5 ohms is connected to 2ohms resistor in series with a parallel combination of two 3ohms resistors (a)draw the circult diagram (b)the effective of external

    asked by Emmanuel on November 23, 2010
  3. Physics EM

    An ammeter is connected in series to a battery of voltage V_b and a resistor of unknown resistance R_u The ammeter reads a current I_0. Next, a resistor of unknown resistance R_r is connected in series to the ammeter, and the

    asked by Spencer on March 6, 2008
  4. Please help asap science

    1. An electrical circuit consists of a battery with 2 cells,each with an EMF of 12 volts and an internal resistance of of 0.4 ohms,connected in parallel. An ammeter with an internal resistance of 0.15 ohms is connected in series

    asked by Sarah on April 7, 2015
  5. Physic

    Two resistors when connected in series to a 120-V line use one-fourth the power that is used when they are connected in parallel. If one resistor is 4.8 kohms. what is the resistance of the other?

    asked by Allen on April 12, 2015
  1. Physics

    A given solar cell has the following specifications: Isc=4A Voc=0.7V 36 identical cells with the above specifications are to be interconnected to create a PV module. 1- What is the open-circuit voltage (in V) of the PV module if

    asked by youlife2015 on October 24, 2013
  2. physics

    1.) Draw a set of 1.5-volt cells in a series circuit so that the total battery voltage is 9 volts. A.) how many cell does it take? B.) show polarity connection. C.) suppose you connected one of the cells in part (a) so that it was

    asked by nitz on September 30, 2012
  3. Chemistry

    How many grams of copper are deposited on the cathode of an electrolytic cell if an electric current of 2.00 A is passed through a solution of CuSO4 for a period of 19.0 min?

    asked by Durbin23 on May 7, 2017
  4. Physics

    Two light bulbs of resistance R1 and R2 (>R1) are connected in a series. Which is brighter? What if they are connected in parallel?

    asked by Prakash Padukone on September 25, 2014
  5. Physics

    A 3.00 - µF and a 4.00 - µF capacitor are connected in series, and this combination is connected in parallel with a 2.00 - µF capacitor (see the figure ). What is the net capacitance? 3.00 - µF 4.00 - µF 2.00 - µF 26.0 V

    asked by Nade on February 29, 2012
  6. Science

    Three dry cells are connected first in series and then in parallel. The individual cells have voltages of 1.5 V, 1.8 V, and 2.0 V. Calculate the total voltage of the cells when they are connected in series and then when they are

    asked by Lily on May 7, 2019

You can view more similar questions or ask a new question.