What structures join with the cell's membrane during exocytosis

Suppose you are titrating a sulfuric acid solution of unknown concentration with a sodium hydroxide solution according to the eq

Inga [223]

Answer:

$M_{acid}=0.0444M$

Explanation:

Hello,

In this case, for the given reaction:

$H _2 S O _4 + 2 N a O H \rightarrow 2 _H 2 O + N a _2 S O_ 4$

We find a 1:2 molar ratio between the acid and the base respectively, for that reason, at the equivalence point we find:

$2*n_{acid}=n_{base}$

That in terms of concentrations and volumes we can compute the concentration of the acid solution:

$2*M_{acid}V_{acid}=M_{base}V_{base}\\\\M_{acid}=\frac{M_{base}V_{base}}{2*V_{acid}}=\frac{0.697M*28.07mL}{2*220.1mL}\\ \\M_{acid}=0.0444M$

Best regards.

5 0

3 years ago

Predict whether the following double-replacement reaction will produce a precipitate: MgCl2 + Li2CO3 MgCO3 + 2 LiCl.

nata0808 [166]

I think the correct answer from the choices listed above is the second option. <span>This is a double displacement reaction. Both of the reactants are soluble, but when they are combined for a reaction, magnesium carbonate will form a precipitate. Hope this answers the question.</span>

5 0

3 years ago

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PLEASE HELP ME If a radioactive substance has an initial mass of 50 grams

Yuri [45]

Answer: $3.125\ g$

Explanation:

Given

Initial mass $A_o=50\ g$

half-life is $T_{\frac{1}{2}}=5\ years$

At any time the left amount is given by

$A=A_o2^{-\dfrac{t}{T_{\frac{1}{2}}}}\\\\\text{Insert the values}\\\\A=50\cdot 2^{-\dfrac{20}{5}}\\\\A=50\cdot 2^{-4}\\\\A=\dfrac{50}{16}\\\\A=3.125\ g$

3 0

3 years ago

Consider the following equilibrium:

Angelina_Jolie [31]

Answer:

1. The equilibrium lies to the left.

$\large \boxed{2. \, \, 5.41 \times 10^{-2} \text{ mol/L}}$

Explanation:

N₂O₄ ⇌2NO₂; Keq = 5.85 × 10⁻³

1. Position of equilibrium

Keq < 1, so the position of equilibrium lies to the left.

2. Equilibrium concentration

(a) Set up an ICE table.

$\begin{array}{rcc}\rm \text{N$_{2}$O}_{4} & \, \rightleftharpoons \, & \text{2NO}_{2} \\\text{E/M}:\qquad \qquad& & 1.78 \times 10^{-2} \\\end{array}$

(b) Calculate the equilibrium concentration

$K_{\text{c}} = \dfrac{\text{[NO$_{2}$]}^{2}}{\text{[N$_{2}$O$_{4}$]}} = \dfrac{(1.78 \times 10^{-2})^{2}}{\text{[N$_{2}$O$_{4}$]}} = 5.85 \times 10^{-3}\\\\\begin{array}{rcl}\\(1.78 \times 10^{-2})^{2}&=&\text{[N$_{2}$O$_{4}$]} \times 5.85 \times 10^{-3}\\\text{[N$_{2}$O$_4$]}&=& \dfrac{(1.78 \times 10^{-2})^{2}}{5.85 \times 10^{-3}}\\\\& = & \mathbf{5.41 \times 10^{-2}}\textbf{ mol/L}\\\end{array}\\$

$\text{The equilibrium concentration of N$_{2}$O$_{4}$ is $\large \boxed{\mathbf{5.41 \times 10^{-2}} \textbf{ mol/L}}$}$

Check:

$\begin{array}{rcl}\dfrac{(1.78 \times 10^{-2})^{2}}{5.41 \times 10^{-2}} & = & 5.85 \times 10^{-3}\\\\5.85 \times 10^{-3} & = & 5.85 \times 10^{-3}\\\end{array}$

It checks.

8 0

3 years ago

During which method of separation is one of the components of the mixture lost

Grace [21]

What type of mixture can be separated by distillation?

Distillation. Distillation is an effective method to separate mixtures comprised of two or more pure liquids. Distillation is a purification process where the components of a liquid mixture are vaporized and then condensed and isolated.

4 0

3 years ago

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