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Mrrafil [7]
3 years ago
9

The object of a general chemistry experiment is to determine the amount (in milliliters) of sodium hydroxide (NaOH) solution nee

ded to neutralize 1 gram of a specified acid. This will be an exact amount, but when the experiment is run in the laboratory, variation will occur as the result of experimental error. Three titrations are made using phenolphthalein as an indicator of the neutrality of the solution (pH equals 7 for a neutral solution). The three volumes of NaOH required to attain a pH of 7 in each of the three titrations are as follows: 82.00, 75.65, and 75.43 milliliters.
Required:
Use a 99% confidence interval to estimate the mean number of milliliters required to neutralize 1 gram of the acid

Mathematics
1 answer:
Bingel [31]3 years ago
7 0

Answer:

THE MEAN NUMBER OF MILLILITRES REQUIRED TO NEUTRALIZE 1g OF ACID LAY BETWEEN 68.43 AND 86.96

Step-by-step explanation:

PLEASE CHECK ATTACHMENT FOR SOLUTION AND STEP BY STEP EXPLANATION

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Answer:

45

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year 1 : 18 in

every year after that he grows 3 in so 3 in so 3x9=27

then 27+18=45

8 0
3 years ago
What do the diagram look like
qaws [65]

Answer:

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Step-by-step explanation:

3 0
2 years ago
Find the standard form of the equation of the parabola with a focus at (0, -3) and a directrix at y = 3. (5 points)
OLEGan [10]

Answer:

From given option ,  the equation of parabola is                                            y = negative x² divided by 12

Step-by-step explanation:

Given as for parabola :

The focus is at (0 , - 3)

The directrix equation is y = 3

Now, equation of parabola parallel to y-axis is

( x - h )² = 4 p ( y - k )

where focus is ( h , k+p )   and  directrix equation is y = k - p

So, from equation

h  = 0     and   k + p = - 3

And y = k - p   i.e k - p = 3

Now solving  ( k + p ) + (  k - p ) = - 3 + 3

or, 2 k = 0  ∴ k = 0

Put the value of k , k + p = - 3

So, 0 + p = - 3    ∴ p = - 3

Now equation of parabola with h = 0  , k = 0  , p = - 3

( x - h )² = 4 p ( y - k )

I.e ( x - 0 )² = 4 × ( - 3 ) ( y - 0 )

Or, x² = - 12 y   is the equation of parabola

Hence  From given option ,  the equation of parabola is                                y = negative x² divided by 12       Answer

7 0
3 years ago
4x-13<11 please help
Elden [556K]

Answer:

x<6

Step-by-step explanation:

4x-13<11

4x<11+13

4x<24

x<24/4

x<6

8 0
3 years ago
A machine makes errors in a certain operation with probability p. There are two types of errors. The fraction of errors that are
Crank

Answer:

Step-by-step explanation:

The concept of binomial probability is applied.

Mathematically from binomial probability ; (nCx)px(1−p)(n-x)

The detailed step by step is as shown in the attachment

7 0
3 years ago
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