Question

The hydrogen ion concentration of a vinegar solution is 0.00010 M. How is this concentration written in scientific notation?

Answer 1

Answer:

1.0

×

10

−

4

Explanation:

In this problem, there are two significant figures. The final answer should also have two significant figures.

All scientific notation should have a non-zero number, followed by a decimal point to it's right, followed by remaining significant figures after that. The first non-zero number is  

1

, so the decimal point should follow the  

1

.

Moving the decimal to the right decreases the power of ten. The current number can be expressed as

0.00010

×

10

0

00

.

0010

×

10

−

1

000

.

010

×

10

−

2

0000

.

10

×

10

−

3

00001

.

0

×

10

−

4

You can write the final answer by ignoring the initial zeros

1.0

×

10

−

4

Answer 2

it was A because look 0.00010

0.00010 will be 00001.0