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3 years ago

Define ""acidity"" of an aqueous solution. How do you compare the strength of acidity of solutions ?

Engineering

1 answer:

Vlad [161]3 years ago

7 0

Answer with Explanation:

The acidity of an aqueous solution is a term used to identify how acidic the solution is. An acidic solution is a solution in which the concentration of hydrogen ions is greater than the concentration of hydroxide ions. In the other case around if the concentration of hydrogen ions is lesser than the concentration of hydroxide ions the solution is termed to be basic or alkaline. For a solution with equal concentration of hydrogen and hydroxide ions the solution is termed to be neutral.

The acidity of solutions is compared on the basis of the concentration of the hydrogen ions reduced to log of base 10 to ease calculations. The comparison is made in terms of 'pH' value which is defined as

$pH=-log[H^+]$

where

$[H^+]$ is the hydrogen ion concentration of the solution in moles per liter of solution.

If the pH is < 7 the solution is acidic and the closer the pH value to 1 the higher is the acidity of the solution.

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A gear train has two gears. The driver gear has 8 teeth and a diametral pitch of 6 teeth/inch. the follower gear has 24 teeth. W

Sliva [168]

Answer:

18 teeth/inch

Explanation:

Given that: i. driver gear has 8 teeth and diametral pitch of 6 teeth/inch.

ii. follower gear has 24 teeth.

Let the followers diametral pitch be represented by x.

Then,

8 teeth ⇒ 6 teeth/inch

24 teeth ⇒ x teeth/inch

So that;

x = $\frac{24 x 6}{8}$

= $\frac{144}{8}$

= 18 teeth/inch

The diametral is 18 teeth/inch

3 0

3 years ago

A mass of 12 kg saturated refrigerant-134a vapor is contained in a piston-cylinder device at 240 kPa. Now 300 kJ of heat is tran

Ket [755]

Answer:

I = 12.706 Amps

Explanation:

Given:

- The mass of saturated R-134a m = 12 kg

- The initial Conditions

P_1 = 240 KPa

Saturated Vapor

- The final Conditions

P_2 = 240 KPa

T_2 = 70° C

- The amount of Heat transferred Q_in = 300 KJ

- The voltage of current source V = 110 V

- The current supplied by the source = I

- The time duration Δt = 6 min

Find:

Determine the current supplied I.

Solution:

- Look-up enthalpies h_1 and h_2 at both states using Tables A-11 and A-13.

P_1 = 240 KPa

Saturated Vapor ----------> h_1 = h_g = 247.32 KJ/kg

P_2 = 240 KPa

T_2 = 70° C ----------> h_2 = 314.53 KJ/kg

- Using First Thermodynamic Law, set up an energy balance:

E_in - E_out = ΔE_system

Q_in + W_electric,in - W_out = Δ U

Q_in + V*I*Δt - W_out = Δ U

Q_in + V*I*Δt = Δ H

Q_in + V*I*Δt = m*( h_2 - h_1 )

- Make the current I the subject of the expression above:

V*I*Δt = m*( h_2 - h_1 ) - Q_in

I = [ m*( h_2 - h_1 ) - Q_in ] / V*Δt

- Plug in the values in the expression derived above and evaluate current of source I:

I = [ 12*( 314.53 - 247.32 ) - 300 ]*1000 / 110*6*60

I = 12.706 Amps

- The required source of current is I = 12.706 Amps.

4 0

3 years ago

The Keystone Pipeline has an inside diameter of 36 inches andcarries a flow rate of 590,000 barrels of crude oil per day at 40°C

xxTIMURxx [149]

Answer:

The pump horse power required per mile of pipe $45.22\ hp/mile$

Explanation:

The explanation is shown on the second third and fourth image

It make sense that the temperature of the oil is high even though the pipeline is in a cold environment this is so because where the oil is been tapped from is way hotter than the temperature of the pipeline environment because it is closer to the earths crust than the environment of the pipeline

7 0

3 years ago

The C language allows developers to pass functions as parameters to other functions. Provide a declaration for a function named

MariettaO [177]

Answer:

answer is given below

Explanation:

Declaration for garnet

void garnet(char,int (*f)(int));

void - garnet return nothing

garnet accepts two parameters

'Char'
function

Function as a parameter

int (*f) (int))

and here

first int refers return type of function

(*f) function as pointer variable

second int

arguments that accept by inner function- function as a parameter

so here Garnet is a function that accepts two parameters. One parameter that contains the character and another parameter that takes an argument (here I am taking an integer) and returns an integer. Function The function returns nothing. Zero is mentioned here.

5 0

4 years ago

You installed a new 40 gallon water heater with a 54,000 BTUh burner. The underground water temperature coming into the house is

allochka39001 [22]

Answer:

For most uses you'll want your water heated to 120 F(49 C) In this example you'd need a demand water heater that produces a temperature rise and it will take about 2 hours

7 0

3 years ago